Shadow Grasp not casting.

[JayMagic]

After the last maint. I've been having an issue which basically destroys my dps and rotation. Even when Shadow Grasp (4) is off cool down it's simply not casting .... i'd spam it 4 or 8 times before it casts.... is anyone else having this issue?? I'm not lagging or anything because if I did... other skills would lag as well. I just got my badge and THIS happens...