Simon...

This is (or can be) a VERY frustrating problem. One which is VERY difficult to track down. I have had similar problems and BOTH times I tracked it to the same cause. Even though you think you found the cause, I am wondering if you would review your code and see if in any of the methods you were SETtingFOCUS to an object that was not yet instaniated on the form. In MY case(s), that seemed to be the problem. Thanks, in advance, for any feedback you can give me on this one. Naturally, I am hoping that the SETFOCUS method is the REAL culprit.

...Dave