Success! Looks like we've fixed this one. According to our records the fix was applied for
I noticed that occasionally Sencha Architect will assign duplicate itemId values to various components. I noticed this specifically on Buttons. I had two Buttons called 'mybutton8' and the app would not render right until I cleared them out.
Sencha - Architect Dev Team
Thanks for the report, can you give us some more insight on how you reproduce this issue?