>Hi Bruce,
>
>As Fred Taylor advised, I found that the object.LockScreen() method was causing the form 'vapour trail'. And to make matters worse, when I removed the object.LockScreen() methods, it didn't make any difference to what I was trying to do which begs the question why i added it in the first place! Therefore, I am hoping that the original problem will now go away. I am planning extensive testing tonight.

Good. I tend to assume that everyone checks Lockscreen the very first thing, but that's not always the case, is it? There is another more complex modal stacking problem, but it's just as well you don't have to deal with it, it's a lot more tricky.

No wonder I didn't recall any vapor trail...