Aye, I've heard of a lot of cases of this happening with a number of different characters, but I've noticed it the most while playing erebus. It seems like some kind of pathing issue, which could help explain why it seems so prevalent in Erebus (since he needs to be so close to connect).

Once you realize what's happening you can quickly click to move then reissue thecommand at very little loss of time, but that's hardly a fix =P

Also can easily spell your doom if it happens mid-swing against rook's hammer of SPLAT

This also happens to me a lot, VERY Frustrating

I can confirme this...having the same problem.

Yep, this has happened multiple times for me as well.  It's usually when I try to execute a bat-swarm + stun + bite combo that it becomes a bat swarm + stun + stand there like a goof combo.

The bite glitch has cost me a few kills as well as earned me a few deaths.

It's a problem a good many characters have in this version, it seems, but it tends to go over more with those that have higher attack speeds.  Sedna, LE, and UB suffer from it quite frequently, when I'm playing them.

I'm thinking it may be something to do with, say, the computer waiting for the attack animation to finish before it starts the casting animation, and there's a certain point where the attack's already done and yet this doesn't register, resulting in a character that just stands there until you interrupt their indecision with a move-click.

same thing happens with Sedna's punch

It happens after you use some kind of warp, whether it be warpstone, cloak of night, bat swarm, ect. you just have to click movement somewhere to start moving and you can use your abilities again. Happens to me when I'm playing erebus and batswarm, or when I play oak and use cloak of night and try to pentinence after I warp to someone.