VISA missing state change on window resize

My code is polling a memory location using VISA (viMoveIn16) over a VXI/VME bus running under Windows NT. This polling is done repeatedly as the memory location changes between values. This normally works quite well and is resistant to processor load. However, should another application be launched or a window resized, the memory location change in value is missed. I have run using NI-Spy and do see the viMoveIn16 commands repeatedly in that log, they just all return the same value (not the one I am looking for). Are there any PC command caching issues that would cause problems on window resize? Is there some reason why the commands would not actually make it to the bus under this scenario? DOesn't the success return
ed from viMoveIn16 indicate that the response has been received? Has anyone experienced a problem similar to this before?

The address space being read is the A16_SPACE. In all of my testing, the failure occurs at a specific location in the code. There are 3 memory reads and 2 of them appear to work correctly. However, the 3rd will catch the resize each time it occurs. All 3 memory reads will work correctly if no resize is encountered. Still looking for the remaining requested data.

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http://forums.ni.com/t5/LabVIEW/Changing-VISA-Synchronous-state/m-p/2358338#M735511
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dawid.loubser wrote:Thanks for the suggestion drtebi - I'll give it a try.
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Last edited by lmello (2013-05-02 14:06:06)

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