I have reinstalled Xcode 7.3. OS X 10.11.5
I have tried with several different repos. Can't commit. Every time. Every commit.
I right click on the file in the Nav panel, select Source Control and Commit "whatever.m".
The working copy failed to commit ""whatever.m".
Thread 4 Crashed:: Dispatch queue: com.apple.NSXPCConnection.user.1032
0 com.apple.dt.Xcode.sourcecontrol.Git0x000000010c8b2511 0x10c89e000 + 83217
1 com.apple.dt.Xcode.sourcecontrol.Git0x000000010c8b0bb9 0x10c89e000 + 76729
2 com.apple.CoreFoundation 0x00007fff8aa53a6c __invoking___ + 140
3 com.apple.CoreFoundation 0x00007fff8aa538fe -[NSInvocation invoke] + 286
4 com.apple.Foundation 0x00007fff9b243eb8 __NSXPCCONNECTION_IS_CALLING_OUT_TO_EXPORTED_OBJECT__ + 17
5 com.apple.Foundation 0x00007fff9b243822 -[NSXPCConnection _decodeAndInvokeMessageWithData:] + 1123
6 com.apple.Foundation 0x00007fff9b2432f0 message_handler + 705
7 libxpc.dylib 0x00007fff8c01e56e _xpc_connection_call_event_handler + 35
8 libxpc.dylib 0x00007fff8c01cde7 _xpc_connection_mach_event + 2198
9 libdispatch.dylib 0x00007fff9988b596 _dispatch_client_callout4 + 9
10 libdispatch.dylib 0x00007fff9988ba08 _dispatch_mach_msg_invoke + 555
11 libdispatch.dylib 0x00007fff99888200 _dispatch_queue_drain + 1207
12 libdispatch.dylib 0x00007fff9988a35f _dispatch_mach_invoke + 735
13 libdispatch.dylib 0x00007fff99888200 _dispatch_queue_drain + 1207
14 libdispatch.dylib 0x00007fff9988e707 _dispatch_queue_invoke + 549
15 libdispatch.dylib 0x00007fff9988340b _dispatch_client_callout + 8
16 libdispatch.dylib 0x00007fff9988729b _dispatch_root_queue_drain + 1890
17 libdispatch.dylib 0x00007fff99886b00 _dispatch_worker_thread3 + 91
18 libsystem_pthread.dylib 0x00007fff962ae4de _pthread_wqthread + 1129
19 libsystem_pthread.dylib 0x00007fff962ac341 start_wqthread + 13
Every repo on my box. Every file I have changed. Every time.
The only things I have done recently are install the Xcode beta and earlier on on Friday, I performed a retch from one of the remote git repos using the latest copy of SourceTree.
Apparently, installing Cordova ask you to issue an Xcode select in the terminal. This may also have an effect.