Abilities frequently will not go off, and block any other mouse action.

[Tartantyco]

It happens often with the crippling strike or whatever with the rogue, I select the ability, try to pick a target, but the game won't respond and I'm now stuck with that mouse action. I can reset this by using the number keys to select another member and right-clicking from there.

[Sensuki]

This is a known issue, it was blatantly obvious in the Gamescom videos

 

Apparently it's already been fixed by the Gameplay Programmer, but it's not been put into the Steam build yet - maybe tomorrow?

[Derek M]

Hey Tartantyco, thanks for the feedback, we really appreciate it! 

Fortunately we are well aware of this issue and it will be resolved in future builds.

 

Also, did you happen to switch weapon sets before trying to cast the spell?

[Tartantyco]

I did not switch weapon sets, no.

[Derek M]

I did not switch weapon sets, no.

Good to know, thanks again!

[Billy O]

I had that issue with the wizard casing the mirror image spell. I did not switch weapon sets either.