Play and Stop Buttons both flashing - track window froze

[Matt Darcy]

for some reason I've manged to almost hit a "pause" mode on pro-tools 7.4

I don't know what I've done but when I press play or record to play/record something the track starts playing but the clock/counter doesn't move - likes it's paused and neither does the guide on screen that follows the track as it plays so the main clock stops on 1|1|000 and sub 0:00:000 (so first bar) even though the song is still playing in the background.

The critical thing is that the stop button is solid blue while the play button flashes blue while playing, almost like a "pause" mode.

I've no idea what I've done to enable this.

Thanks,

Matt.