OK, I submitted some Document Feedback on -cancelAllOperations, referring to 
this thread in the list archives and complaining that the statement "Queued 
operations are cancelled before they begin executing" seems to be an 
oversimplification.

And I was able to solve my deadlock with -waitUntilAllOperationsAreFinished by 
instead adding a key-value observer method for @"operations" and testing if its 
count == 0.

This was my lucky day to have Mike Abdullah and Ken Thomases online when I had 
a threading issue.  Thanks again!_______________________________________________

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