Last night and this morning the CD was 80 seconds as can be seen in my log aswell. But when i tried using it earlier, and again right now it shows 80 second cd but won't let me use it again until 2 minutes. (can't post links so you'll have to fiddle with what i can post)
warcraft logs link = /reports/dKFck13CQTb29wHg#fight=6&type=damage-done&source=12&ability=225777
And here is a very lazily made album showing the tooltip dmg and the actual damage it is doing as both UH and Frost
imgur link = /a/tPhYN
I've tried deleting cache folder twice to no avail so I'm with Hasslehoof at this point and I think Blizz has gone and fuckered it right up.