MIDI problem!!! Please Help!!

I finally updated to OS3. But now i got a problem with the Midi using OS 3. When i put the MIDI setting to "1A", (to record the MIDI to my computer), and press the note on the MPC, the MIDI just keeps repeating itself over and over. It only stops doing that when i turn the MIDI setting to "OFF".

How do i fix this?

Sounds to me like you've got some kind of MIDI feedback - you're sending a note that is echoed back to the MPC input and sent through again, and so on and so on.

Check your MIDI connections, and the MIDI thru status under the MIDI options page, and whether the MPC is set-up to receive note data.