Why Do LV7 VIs Stop Executing When I Click on the Window Title Bar?

I am trying to run a deterministic VI (LV 7.0) which reads data from a DSP and displays it in a graph. The VI has to read the data within a certain time or the DSP overwrites the buffer. I find that the graph stops reading (for about .25 sec) when I click on its title bar (or that of any other VI), and I lose data. The graph is running in the Data Acquisition thread, under Time Critical Priority (the only VI in this thread and with this priority). I have tried a dual 2400 CPU (AMD) under WinXP Pro, and also a PIII-1000 single CPU under Win2000. Same result. I have also tried a bus mouse (USB and PS2) and a serial mouse (COM1) - same result. Under LabVIEWs Tools/Options, I have "Run With Multiple Threads"
checked. How can I ensure that the mouse (or keyboard, for that matter) does not stop my graph VI?

Try making the Call Library Function Node reentrant as well.
Attached is an example. Not a beautiful, but illustrated an experiment I did. With this experiment I have a delay in a loop putting the time the loop took on a queue. The other VI is graphing that time. When I click on the title bar of the graphing VI, it stops responding for a period of time, but the other loop keeps running uniterupted. I have no idea what a dll call would do.
Good luck...
Attachments:
Acquisition_loop.zip ‏17 KB

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Why Do LV7 VIs Stop Executing When I Click on the Window Title Bar?

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