IMAQ USB Snap.vi time out

I'm trying to capture an image in LabView using a veo stingray webcam.
I'm using LabView 7.1 with Vission Assistant 7.1. I've attached my
block diagram. When I press run LabView recognizes my camera, but I
always get the following error.
Error -1074396030 occured at IMAQ USB Snap.vi Time Out.
Any suggestions would be appreciated.
Attachments:
labview.JPG ‏30 KB

The QuickCam is indeed USB. The error appears when the vi is closed without using the IMAQ USB Close.vi (for instance when aborting the execution using the toolbar stop button). So, problem solved. Unfortunatelly this was not the only issue : Now my vi does not crash LV... but returns only a black image...
For professionnal use, I have several NI frame grabbers. For teaching, I don't have a budget for 16 firewire adaptators and cameras . I'll try re-installing the software one more time.
This is not a big problem because as I said before, the grab function is working. However, I don't like giving my students the idea that sometimes only 50 % of LabVIEW functions are working properly.
Chilly Charly    (aka CC)
         E-List Master - Kudos glutton - Press the yellow button on the left...        

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