After upgrading to 1.2.3 I opened my current XDS file (created in 1.2.2).

First things I noticed

1) The new 1.2.3 did something with my project (I saw the * in the title)
2) When I tried to export I get a popup with the message

ReferenceError: Can't find variable: layout

And only 2 options

"Restart" or "Exit Designer"

This is a SERIOUS problem. I'm in the middle of some projects and now I can't even export my Designer files. I can live with the bugs Sencha made with the 1.2.2 build. The bugs are annoying, but still .. I can export the files and work around the problems. Now with the upgrade I can't even export my files.

I'm using a Mac OS X 10.7.4. Designer 1.2.3 build 50

I hope you guys will make this a priority.