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Occassionaly, but fairly often, for no apparent reason, VS 2012 will lock up with a dialogue that says, "Waiting for a background operation to finish". E.g. this may happen during a plain old code edit, not on explicitly invoking any IDE command.
What causes this, and is there anything I can do about this?
I am running ReSharper 7, and I am not the only one I know experiencing this.
Open Visual Studio, create a new MVC application, close the new application, open the old application and it works!
Check if IIS or another process (BizTalk maybe) is locking your DLLs/references
Kill/stop IIS or the other process if it is