[GNC] Operation is still running, wait for it to complete before quitting

[Richard Dawson]

Several hours after after successfully completing reconciliation, I 
attempted to add another transaction, and I was greeted with the 
message, "Operation is still running, wait for it to complete before 
quitting." I've been waiting for an hour or so, and there is no hard 
drive activity.  Attempting to save gives the same message.

  If I recall correctly, I had saved the file when I completed the 
reconciliation,  as that is my general practice, but I left the machine 
on with the file open.

How should I proceed?