Sounds like lag. I know sometimes I found better performance when I stopped moving and started casting skills while stationary. Whether this actually helped or is a placebo effect I have no idea but if you spam the drink potion button eventually your character will pop the cork off and drink the liquid. Might take pressing it a half dozen times though.
You can't drink potions while:
Stunned (and similar effects)
Sprint
Channel skills (heavy attack included)
Walking should not stop you, you were probably ZoSed
Mankeyyyyy wrote: »It's great when you hear the potion sound multiple times while slamming the button but the potion never actually goes off.