Just got done updating my box to osx 10.8.4 and everything appeared to be functioning fine until I began using xcode. The first time I build a project it runs on the simulator fine. The second time I build the same project I get a sigabrt in main. I tried catching all exceptions but none are being thrown. This happens on existing projects or even brand new ones. I tried 'Reset content and settings' on simulator, rebooting the machine, and cleaning the project. All of which had no effect. Considering re-installing xcode, but wanted to see if anyone else can reproduce or had any ideas.
Update your Xcode. Xcode 4.6.3 solves the issue.
If you can't, TUAW has a solution (or workaround, however you want to see it).