When I try to use the SiteCatalyst plugin for Flash Builder with version 4.5, I'm unable to create a tracker library.  

 

I type in the name for the library, hit OK, and it churns for about 5 minutes.  In the background you can see a project and folders being created (no source files are created, however), but eventually the dialog closes, and the project and folders have been removed.  

No error is shown, and I couldn't see anything in eclipse log files.