I have done all my programming and playback with my M-Play connected to "laptop A" with no issues. I want to designate "laptop B" as a backup PC, but it does not let the M-Play function. I see that the M-Play driver is installed, the device details say it's functioning properly, it's recognized as a Martin M-Play, but no action on the M-Play. The M-Play does have those very dim green LEDs lit at the top and bottom of each fader though. The "laptop B" is an Acer Aspire Pentium 2.4GHz w/ 4GB of RAM, but I hope I don't get the response "just get a PC that meets the requirements." I really want to understand what the issue is. Thanks!