Deleting "Prompt User" dialog causes VI to lock PC or run very slowly.

I have been coding a VI in LabVIEW 8.2.1 for several weeks and had to go back and remove some "Prompt User" dialog boxes. After removing them, the VI would cause my PC to become unresponsive. In an attempt to isolate the problem, I started to remove sections of code and discovered that there is a single dialog that seems to be causing this issue.
The VI runs fine with the dialog left in, but causes problems when removed. Even if the dialog is logically impossible to enable, it still runs fine. I currently have the VI set to run at a high priority because timing is critical for this application. Lowering the priority seems to alleviate the issue, but I would rather not do this.
I am not sure how to proceed from this point, and I had trouble finding a similar issue in the forums. Perhaps this problem is specific to my PC. I would appreciate any feedback.
I have attached the VI with this post. I have removed almost all functionality from the VI but it still demonstrates the problem . This version does not lock the computer, but does cause it to run very slowly when it misbehaves.
If you need any more information, let me know.
Attachments:
ProblemDialog.vi ‏46 KB

The reason probably has to do with you having a loop that is set to run at full speed. This can hog processor time. Insert a "Wait.vi" or a "Wait until next ms multiple.vi" inside your while loop and wire in a value of 10 ms and see if the problem goes away. Even wiring in a value of 0 or 1 ms might do the trick. If your vi is meant to react only to user input, you could even put in a wait of 100 or 200 ms, and the user will not notice it. This way your processor will have lots of time to run other tasks or applications.
By the way, your vi did not slow down on my system, but that is probably because it is a multiprocessor system.
Message Edited by Sudhir Gopinath on 06-14-2007 01:07 PM
Message Edited by Sudhir Gopinath on 06-14-2007 01:10 PM
S G
Certified LabVIEW Architect, Certified TestStand Developer, Certified Professional Instructor

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i have a big problem. I cannot change my process template,
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Deleting "Prompt User" dialog causes VI to lock PC or run very slowly.

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