I'm suffering badly from this http://bugs.adobe.com/jira/browse/FB-26510
It's now preventing me from viewing some of my components in Design Mode, while others work. I can still compile and run the app but without a functioning design view it's neither fun nor efficient any more...
Is there no way to get a more recent build of Flash Builder?
There is no date yet. But you can expect it soon. Will update the forum when more details come in.