I read all the threads on this issue and came up empty. Sometime back in the past I had the same problem and someone suggested I delete some kind of .ini file. I deleted aud.ini, cakewalk.ini, with no success. Then I did a reset of the config settings in Preferences. Still no nudge.
 
If someone responds with "Is your NumLock on?" I'm gonna send 'em my rendition of Yummy, Yummy, Yummy.

Does it work via the process menu or is it completely broken? I have had the Kayboard shortcut stop working previosly and fixed it by  using the 'zap all' under settings and restoring the Sonar defaults.

......and is your numlock on