I have installed the designer (tried 0.3.4 & master) on my localhost. When 
I click the <> button to go to source mode and click again to go back to 
wysiwig, I get the following messages in the console and the contents of my 
element (if any) are lost. It even happens with an empty canvas.

I have been playing around with metadata, and thought I may have caused the 
error, so I checked out a fresh copy from github - same result.

Exception caught during observer callback: TypeError: undefined is not a 
function at Polymer.ensureMeta (
http://localhost:3000/components/x-meta/x-meta.html/x-meta.js:143:47 
<http://localhost:3000/components/x-meta/x-meta.html/x-meta.js>) at 
Polymer.loadElementImports (
http://localhost:3000/elements/design-host/design-host.html/[1766].js:119:22 
<http://localhost:3000/elements/design-host/design-host.html/[1766].js>) at 
Polymer.loadHtml (
http://localhost:3000/elements/design-host/design-host.html/[1766].js:93:12 
<http://localhost:3000/elements/design-host/design-host.html/[1766].js>) at 
Polymer.loadHtml (
http://localhost:3000/elements/design-canvas/design-canvas.html/[1157].js:512:21
 
<http://localhost:3000/elements/design-canvas/design-canvas.html/[1157].js>) 
at Polymer.loadHtml (
http://localhost:3000/elements/design-frame/design-frame.html/[1561].js:50:19 
<http://localhost:3000/elements/design-frame/design-frame.html/[1561].js>) 
at Polymer.loadHtml (
http://localhost:3000/elements/designer-element/designer-element.html/[1645].js:312:19
 
<http://localhost:3000/elements/designer-element/designer-element.html/[1645].js>)
 
at Polymer.codeToDesign (
http://localhost:3000/elements/designer-element/designer-element.html/[1645].js:210:10
 
<http://localhost:3000/elements/designer-element/designer-element.html/[1645].js>)
 
at Polymer.selectedChanged (
http://localhost:3000/elements/designer-element/designer-element.html/[1645].js:155:12
 
<http://localhost:3000/elements/designer-element/designer-element.html/[1645].js>)
 
at g.invokeMethod (
http://localhost:3000/components/polymer/polymer.js:12:13312 
<http://localhost:3000/components/polymer/polymer.js>) at 
g.notifyPropertyChanges (
http://localhost:3000/components/polymer/polymer.js:12:11598 
<http://localhost:3000/components/polymer/polymer.js>) 

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