diff --git a/scripts/hetzner/deployHetzner.sh b/scripts/hetzner/deployHetzner.sh
index 63dc7e07a..8498129bd 100755
--- a/scripts/hetzner/deployHetzner.sh
+++ b/scripts/hetzner/deployHetzner.sh
@@ -11,9 +11,9 @@
 
 cp config.json config.json.bu &&
 cp ./scripts/hetzner/config.json . && # Copy the config _before_ building, as the config might contain some needed URLs
-npm run reset:layeroverview
-npm run test
+# npm run reset:layeroverview
 npm run prepare-deploy &&
+npm run test &&
 zip dist.zip -r dist/* &&
 mv config.json.bu config.json &&
 scp ./scripts/hetzner/config/* hetzner:/root/ &&
diff --git a/src/Models/ThemeConfig/Conversion/Conversion.ts b/src/Models/ThemeConfig/Conversion/Conversion.ts
index 71863250c..1e23edbcc 100644
--- a/src/Models/ThemeConfig/Conversion/Conversion.ts
+++ b/src/Models/ThemeConfig/Conversion/Conversion.ts
@@ -39,6 +39,12 @@ export class ConversionContext {
     }
 
     static print(msg: ConversionMessage) {
+        const noString = msg.context.path.filter(
+            (p) => typeof p !== "string" && typeof p !== "number"
+        )
+        if (noString.length > 0) {
+            console.warn("Non-string value in path:", ...noString)
+        }
         if (msg.level === "error") {
             console.error(
                 ConversionContext.red("ERR "),
diff --git a/src/UI/Studio/EditLayer.svelte b/src/UI/Studio/EditLayer.svelte
index bcbc03ead..e6dc6fb6e 100644
--- a/src/UI/Studio/EditLayer.svelte
+++ b/src/UI/Studio/EditLayer.svelte
@@ -1,6 +1,6 @@
 <script lang="ts">
 
-  import { LayerStateSender } from "./EditLayerState";
+  import EditLayerState, { LayerStateSender } from "./EditLayerState";
   import layerSchemaRaw from "../../assets/schemas/layerconfigmeta.json";
   import Region from "./Region.svelte";
   import TabbedGroup from "../Base/TabbedGroup.svelte";
@@ -8,11 +8,13 @@
   import type { ConfigMeta } from "./configMeta";
   import { Utils } from "../../Utils";
   import type { LayerConfigJson } from "../../Models/ThemeConfig/Json/LayerConfigJson";
+  import type { ConversionMessage } from "../../Models/ThemeConfig/Conversion/Conversion";
 
   const layerSchema: ConfigMeta[] = <any>layerSchemaRaw;
 
-  export let state;
+  export let state: EditLayerState;
   const messages = state.messages;
+  const hasErrors = messages.map((m: ConversionMessage[]) => m.filter(m => m.level === "error").length);
   export let initialLayerConfig: Partial<LayerConfigJson> = {};
   state.configuration.setData(initialLayerConfig);
   const configuration = state.configuration;
@@ -37,9 +39,18 @@
   }
   const leftoverRegions: string[] = allNames.filter(r => regionBlacklist.indexOf(r) < 0 && baselayerRegions.indexOf(r) < 0);
   const title: Store<string> = state.getStoreFor(["id"]);
+  const wl = window.location
+  const baseUrl = wl.protocol+"//"+wl.host+"/theme.html?userlayout="
 </script>
 
-<h3>Editing layer {$title}</h3>
+<div class="w-full flex justify-between">
+  <h3>Editing layer {$title}</h3>
+  {#if $hasErrors > 0}
+    <div class="alert">{$hasErrors} errors detected</div>
+  {:else}
+    <a class="primary button" href={baseUrl+state.server.layerUrl(title.data)} target="_blank" rel="noopener">Try it out</a>
+  {/if}
+</div>
 <div class="m4">
   <TabbedGroup tab={new UIEventSource(2)}>
     <div slot="title0">General properties</div>
diff --git a/src/UI/Studio/EditLayerState.ts b/src/UI/Studio/EditLayerState.ts
index e9eaed972..dc15a1682 100644
--- a/src/UI/Studio/EditLayerState.ts
+++ b/src/UI/Studio/EditLayerState.ts
@@ -177,7 +177,12 @@ export default class EditLayerState {
             }
             entry = entry[breadcrumb]
         }
-        if (v !== undefined && v !== null && v !== "") {
+        if (
+            v !== undefined &&
+            v !== null &&
+            v !== "" &&
+            !(typeof v === "object" && Object.keys({}).length === 0)
+        ) {
             entry[path.at(-1)] = v
         } else if (entry) {
             delete entry[path.at(-1)]
diff --git a/src/UI/Studio/SchemaBasedField.svelte b/src/UI/Studio/SchemaBasedField.svelte
index 11f972306..573e57bd5 100644
--- a/src/UI/Studio/SchemaBasedField.svelte
+++ b/src/UI/Studio/SchemaBasedField.svelte
@@ -16,7 +16,7 @@
     export let state: EditLayerState
     export let path: (string | number)[] = []
     export let schema: ConfigMeta
-    let value = new UIEventSource<string>(undefined)
+    let value = new UIEventSource<string | any>(undefined)
     
     const isTranslation = schema.hints.typehint === "translation" || schema.hints.typehint === "rendered" || ConfigMetaUtils.isTranslation(schema)
     let type = schema.hints.typehint ?? "string"
@@ -122,7 +122,7 @@
                 }
                 return Number(v)
             }
-            if (isTranslation) {
+            if (isTranslation && typeof v === "string") {
                 if (v === "") {
                     return {}
                 }
diff --git a/src/UI/Studio/StudioServer.ts b/src/UI/Studio/StudioServer.ts
index aa1f81e23..52e737e49 100644
--- a/src/UI/Studio/StudioServer.ts
+++ b/src/UI/Studio/StudioServer.ts
@@ -22,9 +22,7 @@ export default class StudioServer {
 
     async fetchLayer(layerId: string): Promise<LayerConfigJson> {
         try {
-            return await Utils.downloadJson(
-                this.url + "/layers/" + layerId + "/" + layerId + ".json"
-            )
+            return await Utils.downloadJson(this.layerUrl(layerId))
         } catch (e) {
             return undefined
         }
@@ -35,7 +33,7 @@ export default class StudioServer {
         if (id === undefined || id === "") {
             return
         }
-        await fetch(`${this.url}/layers/${id}/${id}.json`, {
+        await fetch(this.layerUrl(id), {
             method: "POST",
             headers: {
                 "Content-Type": "application/json;charset=utf-8",
@@ -43,4 +41,8 @@ export default class StudioServer {
             body: JSON.stringify(config, null, "  "),
         })
     }
+
+    public layerUrl(id: string) {
+        return `${this.url}/layers/${id}/${id}.json`
+    }
 }
diff --git a/src/UI/StudioGUI.svelte b/src/UI/StudioGUI.svelte
index be7d82f9c..ee4d3536a 100644
--- a/src/UI/StudioGUI.svelte
+++ b/src/UI/StudioGUI.svelte
@@ -15,10 +15,12 @@
   import { QueryParameters } from "../Logic/Web/QueryParameters";
 
   import layerSchemaRaw from "../../src/assets/schemas/layerconfigmeta.json";
+  import If from "./Base/If.svelte";
 
-  export let studioUrl = /*"https://studio.mapcomplete.org"; /*/ "http://127.0.0.1:1235"; //*/
+  export let studioUrl = /* "https://studio.mapcomplete.org"; /*/ "http://127.0.0.1:1235"; //*/
   const studio = new StudioServer(studioUrl);
-  let layers = UIEventSource.FromPromise(studio.fetchLayerOverview());
+  let layersWithErr = UIEventSource.FromPromiseWithErr(studio.fetchLayerOverview());
+  let layers = layersWithErr.mapD(l => l.success);
   let state: undefined | "edit_layer" | "new_layer" | "edit_theme" | "new_theme" | "editing_layer" | "loading" = undefined;
 
   let initialLayerConfig: { id: string };
@@ -61,8 +63,8 @@
             }]
           }
         ],
-        lineRendering : [{
-          width : 1,
+        lineRendering: [{
+          width: 1,
           color: "blue"
         }]
       };
@@ -82,73 +84,99 @@
 
 </script>
 
-<LoginToggle state={{osmConnection}} ignoreLoading={true}>
-  <div slot="not-logged-in">
-    <NextButton clss="primary">
-      Please log in to use MapComplete Studio
-    </NextButton>
-  </div>
-  {#if state === undefined}
-    <h1>MapComplete Studio</h1>
-    <div class="w-full flex flex-col">
+<If condition={layersWithErr.map(d => d?.error !== undefined)}>
+  <div>
+    <div class="alert">
+      Something went wrong while contacting the MapComplete Studio Server: {$layersWithErr["error"]}
+    </div>
+    The server might be offline. Please:
+    <ul>
 
-      <NextButton on:click={() => state = "edit_layer"}>
-        Edit an existing layer
-      </NextButton>
-      <NextButton on:click={() => state = "new_layer"}>
-        Create a new layer
-      </NextButton>
-      <NextButton on:click={() => state = "edit_theme"}>
-        Edit a theme
-      </NextButton>
-      <NextButton on:click={() => state = "new_theme"}>
-        Create a new theme
+      <li>
+        Try again in a few minutes
+      </li>
+      <li>
+        Contact <a href="https://app.element.io/#/room/#MapComplete:matrix.org">the MapComplete community via the
+        chat.</a> Someone might be able to help you
+      </li>
+      <li>
+        File <a href="https://github.com/pietervdvn/MapComplete/issues">an issue</a>
+      </li>
+      <li>
+        Contact the devs via <a href="mailto:info@posteo.net">email</a>
+      </li>
+    </ul>
+  </div>
+  <LoginToggle ignoreLoading={true} slot="else" state={{osmConnection}}>
+    <div slot="not-logged-in">
+      <NextButton clss="primary">
+        Please log in to use MapComplete Studio
       </NextButton>
     </div>
-  {:else if state === "edit_layer"}
-    <div class="flex flex-wrap">
-      {#each Array.from($layers) as layerId}
-        <NextButton clss="small" on:click={async () => {
+    {#if state === undefined}
+      <h1>MapComplete Studio</h1>
+      <div class="w-full flex flex-col">
+
+        <NextButton on:click={() => state = "edit_layer"}>
+          Edit an existing layer
+        </NextButton>
+        <NextButton on:click={() => state = "new_layer"}>
+          Create a new layer
+        </NextButton>
+        <!--
+        <NextButton on:click={() => state = "edit_theme"}>
+          Edit a theme
+        </NextButton>
+        <NextButton on:click={() => state = "new_theme"}>
+          Create a new theme
+        </NextButton>
+        -->
+      </div>
+    {:else if state === "edit_layer"}
+      <div class="flex flex-wrap">
+        {#each Array.from($layers) as layerId}
+          <NextButton clss="small" on:click={async () => {
         state = "loading"
         initialLayerConfig = await studio.fetchLayer(layerId)
         state = "editing_layer"
        }}>
-          <div class="w-4 h-4 mr-1">
-            <Marker icons={fetchIconDescription(layerId)} />
-          </div>
-          {layerId}
-        </NextButton>
-      {/each}
-    </div>
-  {:else if state === "new_layer"}
-    <div class="interactive flex m-2 rounded-2xl flex-col p-2">
-      <h3>Enter the ID for the new layer</h3>
-      A good ID is:
-      <ul>
-        <li>a noun</li>
-        <li>singular</li>
-        <li>describes the object</li>
-        <li>in English</li>
-      </ul>
-      <div class="m-2 p-2 w-full">
-
-        <ValidatedInput type="id" value={newLayerId} feedback={layerIdFeedback} on:submit={() => createNewLayer()} />
+            <div class="w-4 h-4 mr-1">
+              <Marker icons={fetchIconDescription(layerId)} />
+            </div>
+            {layerId}
+          </NextButton>
+        {/each}
       </div>
-      {#if $layerIdFeedback !== undefined}
-        <div class="alert">
-          {$layerIdFeedback}
+    {:else if state === "new_layer"}
+      <div class="interactive flex m-2 rounded-2xl flex-col p-2">
+        <h3>Enter the ID for the new layer</h3>
+        A good ID is:
+        <ul>
+          <li>a noun</li>
+          <li>singular</li>
+          <li>describes the object</li>
+          <li>in English</li>
+        </ul>
+        <div class="m-2 p-2 w-full">
+
+          <ValidatedInput type="id" value={newLayerId} feedback={layerIdFeedback} on:submit={() => createNewLayer()} />
         </div>
-      {:else }
-        <NextButton clss="primary" on:click={() => createNewLayer()}>
-          Create layer {$newLayerId}
-        </NextButton>
-      {/if}
-    </div>
-  {:else if state === "loading"}
-    <div class="w-8 h-8">
-      <Loading />
-    </div>
-  {:else if state === "editing_layer"}
-    <EditLayer {initialLayerConfig} state={editLayerState} />
-  {/if}
-</LoginToggle>
+        {#if $layerIdFeedback !== undefined}
+          <div class="alert">
+            {$layerIdFeedback}
+          </div>
+        {:else }
+          <NextButton clss="primary" on:click={() => createNewLayer()}>
+            Create layer {$newLayerId}
+          </NextButton>
+        {/if}
+      </div>
+    {:else if state === "loading"}
+      <div class="w-8 h-8">
+        <Loading />
+      </div>
+    {:else if state === "editing_layer"}
+      <EditLayer {initialLayerConfig} state={editLayerState} />
+    {/if}
+  </LoginToggle>
+</If>