mouse drag freezes

[ESchell]

When running a fairly large vi in LV 6.1, I try to
drag the application window (click on the window bar
and drag), and it doesn't respond (cursor moves, but
window stays in place) until I hit the
control key. The the window moves to the new position. It happens on multiple computers of
different types and ages including a 1.8GHz Dell with
256MB of memory and plenty of HDD space. windows 2000
and windows xp. What's going on?

[m3nth]

I have never seen such an issue and I certainly won't claim to be an expert on such things. If that happened to me personally I would probably check my video card and play with the hardware acceleration settings (to see if changing them would make the problem go away or not). Especially if the different computers had the same video card. At any rate, do you have one application that LabVIEW does this with by any chance? Or does it do it with all of them? And is it only LabVIEW? Do other applications do this when lots of stuff is loaded? When LabVIEW is running? my $.02

[ESchell]

I think I solved it: I just had a while loop that
was continuously polling certain controls when the
program is in a certain state. I looked at the
windows task manager and the cpu was 100% utilized.
So I put a wait-on-uif-activity block in the loop,
and the window started behaving normally.