More than once, I've double-clicked a .xib file from the project tree to open it in XCode, and Xamarin Studio beachballs for several seconds before giving a message box indicating a null pointer exception.
Then, all my .xib files are no longer in my project. They still exist on disk, but I have to go and manually add them back to the project. Once the .xib files are added back, double-clicking then works. So the problem is transient... But very, very frustrating.
Anyone else seen this? Is there some kind of log or report generated that I can send to help get this bug squashed?