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

Question

I installed Xcode 6.3 which includes support for Swift 1.2. It turned up a ton of error messages, which are mostly casting issues.

I navigated to the storyboard, an

Answer 1

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

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EDIT : Bug fixed -> Update Xcode 6.3.1

Answer 2

Here's how I get around this strange bug:

1. Before launching Xcode, rename the storyboard file in finder so that Xcode won't find it (e.g. add the extension .temp)
2. Launch Xcode - works fine even if it hanged before since it cannot display the storyboard editor
3. Open a new window in Xcode
4. Rename the storyboard file to its original name
5. In the new window in Xcode - select the storyboard - Xcode does not hang
6. Minimize the new window and work as usual in the original window. Now you can select any file - even the storyboard - without Xcode hanging

One problem remains, though, at least for me. Every time I select a file or edit something, Xcode needs to recompile the storyboard. Haven't solved that one yet.