Had a lock up 
Would not complete processing a track to mono so I ended Sonar with task manager. On rerun, it could not find my sound card/interface, nor would it play.
Got that sorted with rebooting the interface a couple of time and rerunning Sonar, but still no songs play and the now time doesn't work other than 1 second, each time I hit space bar.
Ideas?

Make sure your master bus is directed to your main outs 1/2 of your sound card. Make sure your tracks go to your master bus

Cj

Oh, make sure your recording and playback timing master are set up to your audio interface

Cj

Aha! it was the recording and playback timing master!
Thanks so much.

Your welcome Glenn :)