Weird thing happens with PDW

Ok I get this weird thing occurring sometimes with PDW.
If PDW is working. Sometimes Outlook will interrupt that I've got a new message. I'll switch over to Outlook and when I come back Visual basic has "minimized" itself. Not the minimization isn't to the task bar, but it looks like the program is working inside a MDI and is a MDI child window minimized inside a parent.
However the minimization locks up VB and I can't access the program anymore. In fact I have to kill the application and restart VB.

I don't know if anyone else has experienced this. But it's happened a few time to me and it's becoming annoying. Has anyone else experienced this?

I have had similar experiences, though not using Outlook, and not always just in VB/PDW (occasionally in Office apps, too). It's often followed by a GDI IPF. I haven't found any documentation about it, so I've just been living with it. For me, it seems to happen only on lower-end PCs, so perhaps a video or memory issue?

This sometimes happens to me when I RUN (F5) a large program\project. It tends to happen when I have a few windows open. :(

I tried doing something about it, but I just leard to live with it. :D