MAX error insufficient location information or the device is not present

Hello,

    We have been getting this error once in a while on our test system.  (See attachment)  Our system is running Windows 7, MAX 5.5.0f0, TestStand 4.2.1 and LabView 2010 SP1. 

   To get the error to clear and the system to run we have to go in and rename each VISA to a bogus name and save it.  Then go back and rename them back to what they should be and save again. 

   We get this error maybe once every 3 or 4 months, but it does stop production until we get in and fix it.  What is going on and how do we fix it?

Thanks,

Steve Feeser