Question: Anyone have the problem with Undo operation (Cmd + Z) in Xcode?
When I am edit my Objective-C code with Undo operation, some symbols are not correctly edited.
For instance:
was {   

with Undo {{   

XCode 4.2.1

Answer: 
I have XCode 4.3.2 and I have exactly the same problem. This is a serious bug in XCode 4.3.2 especially because of the nonsense edit that it tossed around in various places in the code file that is being edited before XCode 4.3.2 crashes.
they fixed this partially in Xcode 4.3.1, it doesn't occur that often anymore