>Thanks Vladimir, I would like to think the answer is as simple as
>CANCEL
>but that would be using the principle of Occam's razor.
>
>As I said in my reply to Khubaib, perhaps the problem was more memory related as it hasn't occured since my first message post.

The point of using CANCEL command is that the form may still be running. You had an error occur, but you did not cancel/quit the running of the form. I have seen this on occasion. You can go to the "Program" menu -- if the "Cancel" option is available, then the form is still running.