For some reason a test db became corrupt (most likely).  As a result the program got stuck "updating who status"; i.e. it never got out the process. Meanwhile I couldn't close the program normally, <ESC> wasn't an option. I removed & re-installed program & opened same db w same result.  Removed / re-installed program & opened a different db w/o problem.  This situation is a little scary for me imaging what if it had been a meaningful db that I could no longer access. Perhaps I could import it; didn't try that but seems to me that there should be some global override in the event this occurs again.