I have a VB 2008 application to which I recently added a couple of timers. Since then, when I maximise the VB form and then reset it to its "normal" size, I find that the desktop behind the form is corrupted; several of us get a second copy of the desktop icons and background overlaid where the form was. Another colleague finds the icons on his desktop flickering as if the cursor is tabbing from one to the next very quickly.
The duplication effect seems to pick up the contents of the desktop from behind the maximised form, and copy them behind the form when it is normalised. A partial screenshot of the problem is attached.
I think this might be a video driver issue as the three users with the duplication problem have Nvidia 7300 LE cards, and the user with the flicker has an Nvidia 8600 GT. However, I've updated my driver to the latest version with no effect. Does anyone have any experience of a similar problem? We're running Windows XP Pro on Dell machines.
With thanks in anticipation,