microkey37 - problems with octave buttons

[lexicon_dev00]

Hello,
I just bought a microkey37 and i'm using it plugged to my iMac (intel, OS 10.8.1) through Garageband. The sound is alright but everytime i hit the octave button (it doesnt matter if is the "up" or "down") i stop hearing them.

Sometimes i can play like two or three notes with the octave shifted after the keyboard crashes. To hear the sound again i must turn it off and on again.
I downloaded that Loung Lizzard software (that comes with the controller) and the same thing happens, no sound after hitting octave shift buttons...

I assumed it was a problem with the driver, so I installed the most recent driver that Korg offers (this one: http://www.korg.com/uploads/Download/US ... 20(r1).dmg), it didnt work.

Also, i just noticed that the same happens when i plug any device on micorkey usb side ports: suddenly the sound stops.

Is it possible to be a problem with the controller itself? Any ideas?
Thanks!!

[lexicon_dev00]

Problem solved:
I was connecting the controller to the computer via an extension cable. Don't know if it was a defective cable or just tha fact that ther was a cable in the equation, but as soon as i pluged the controller directly to the usb port in the computer, my problem was gone.