Since the 11/24/14 patch, a few of my skills now no longer show a cooldown duration. They appear as ready to use, but are unable to be used until the invisible cooldown is over.
Skills showing no cooldowns:
Soul Extortion
Restoration
I tried to capture it in a video but I was lagging >.< You can kind of see the issue near the end though. The cd message pops out then, and you can clearly see skills that display the cd timer correctly vs those that don't display anything even though they should.