Is anyone else experiencing annoying crashes and lock-ups in XCode 4? While debugging my multi-threaded apps (pthread, not GCD), I can navigate around in the paused state for about 45 seconds, after which I almost ALWAYS get a beach ball, XCode goes to 100% CPU utilization, and I have to force quit it. Occasionally, I'll get a SEGFAULT which the crash reporter tells me is an xcode GarbageCollection thread, and occasionally this lock-up will occur while I'm in the middle of typing inside a code window. I tried re-running the XCode 4 installer, changing the debugger from GDB to LLDB and none of it seems to help. I never had these problems with XCode 3, and being that this is the first version of XCode I've actually had to pay for, I'm quite disappointed.