Checksum Error problem

[RAD]

I have read the manual, and have done everything specified. Actually, the unit works fine with my software otherwise, although if it is worth anything, the loopback test in Sounddiver didn't complete. I have the unit set to the same channel as the software, I have disabled Midi Clock RX, enabled Midi dump RX, set the tempo very low, and I still get the checksum error. It occurs almost immediately after I press play. Also, just to be sure that the manual wasn't wrong, I went back and tried the update with different settings. This is why I am looking for specific information. The manual hasn't helped, and I though that perhaps someone here who has either had the problem or who has done this successfully could comment on what might be going wrong.