Xcode 6.3 Crashes when navigating from storyboard to other Swift 1.2 file

I gather from the apple developer forums that this is an @IBDesignable issue. Especially in projects that use custom fonts, additional xibs, etc.

I have somehow fixed my issue by removing all @IBDesignable from swift UIView class definitions. You can open your project directory with TextMate or other, search and remove all "@IBDesignable"

However I still think this is a MAJOR bug, that needs to be worked on.. so keep filing bug reports to Apple.

A temporary solution:

By opening a "New Window" (same project).

One for the code, one for the storyboard or reduce first, work freely with second window.

You can keep your @IBDesignables

EDIT : Bug fixed -> Update Xcode 6.3.1