>Geo,
>
>>I'm thinking that the app may still have been running when the user turned off their computer. I haven't tested that scenario.
>
>Could they have been running 4 instances of the app when the computer was shutdown?

Nope, if they were, they done broke my mutex thingy.:-) This was actually handled by the error handler which presents a dialog with Abort, Retry, Ignore buttons. Maybe I need to be a bit less generic with the dialog< bg >. Anyway, it's not unusual to see multiple message like this.