OK, Steve, that makes sense. However, I'm still wondering why the Retail probe will not work correctly after the dlls are installed. The meter is recognized, there are no error messages, but once the setup of the meter is complete in Options and a profiling session is initiated, the program will switch to the virtual meter without warning. Weird. I've been having issues off and on with permissions randomly changing and perhaps this is somehow related to that. Anyway, I'll stick with my OEM meter. It's newer than the Retail.