I just upgraded everything and went with Xcode 6.3. Now I hear that 6.3.1 is to fix 'critical issues' ... http://appleinsider.com/articles/15...critical-issues-related-to-debugging-and-more All I care about is a functional stable system. Is 6.3 solid? Has anyone upgraded to 6.3.1? Although I've only read about Swift, is it stable now?