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bqMTester setup

Other Parts Discussed in Thread: BQMTESTER

I am having some problems with my bqMTester setup. I am using the HPA169 Multi-Tester and EV2300 in a dedicated housing with external LEDs (powered by an isolated DC-DC converter off the 5V power supply).  When I try to run the Station Setup program I get

"Board 0 was either disconnected or is in use by another program. Please make corrections and try again."

followed by

"Communications Error -1 trying to read board firmware version."

and then

"Communications error 2 trying to read ID for board 0"

Note that this is on a computer which formerly was able to operate the exact same setup without problems.  I have tried running the setup on a different computer (both running Windows XP Professional, not Win7) and it works fine, but when I connect it to the original computer it gives the error messages listed above.  I have tried swapping out the EV2300, the HPA169, and the calibrated board under test, all with no effect.  I have even tried uninstalling and reinstalling the bqMTester software suite to no avail.

Can anybody help me?