Kontakt does not detect my midi input.

This never used to be a problem, yet all of a sudden Kontakt is not receiving input from my Alesis DM10.

It is detected by Windows, drivers are up to date. It is detected by Reaper and is set as my virtual instrument/input method. But nothing is shown in Kontakt. Previously I just set MIDI to "Omni" and it would just work, but that no longer appears to do the job. I also have no "MIDI" under the options menu in Kontakt. I have no idea what the hell is going on. Why is Kontakt the only thing not finding my DM10?!