Xcode - Source keeps disappearing and App crashes

Question

I've got a weird issue going on with Xcode and any help is appreciated. I'm running Xcode 4.6.3, building a fairly large project (~40k lines of code).

I open a source file to edit, go about editing the source file and suddenly xcode scrolls to the top of the file and "cuts off" the bottom part of it. I try to scrolldown, nothing happens Code almost looks like an image file that's cut off.

Couple of seconds later, the entire source disappears and I just view a blank page where the source code used to be and then after half a second, Xcode crashes.

If I delete the derived data and the user interface state file in ~/Library/Contents/Developer, things are temporarily back to normal.

This issue still happens frequently enough to be very annoying. Any suggestions?

Thanks,
Teja

EDIT: Should mention that this is happening only on Mavericks. 4.6.3 + Mountain Lion used to work great.

EDIT2: Here's a video if it helps: http://www.youtube.com/watch?v=EOtCbfRn9A4&feature=youtu.be

Answer 1

I've posted the same question in the Apple forums and they just said Xcode 4.6.* is not supported on Mavericks. I've upgraded to Xcode 5 and haven't had this issue since.

Marking it as accepted until someone else comes up with a better answer.