Is the track you are recording to a midi track (not audio)?

Have you tried rebooting?
Did you move the USB connection?

Some of the USB to MIDI devices install and get 'stuck' on that port. If you moved it,reboot and move it back, or re-install the driver. If you re-install the driver wjile plugged into a different port, be forewarned you may end up installing multiple instances of the driver. I *thik* the Uno is one of the devices that has had this issue with being on a different port.

Otherwise, double check the settings. If it worked before, something changed..


Make your sound your own!
.. I do not work here, but the benefits are still awesome