Yeah, the problem is the AI waiting for the camera to focus it, while the camera can stall sometimes when you move it while it attempts to focus an enemy whose turn just started. Shouldn’t happen, of course – I’ll see to it that the camera can’t be moved manually in these situations. Like you said, getting the enemy in question inside the screen – either by clicking him in the action queue or moving the camera manually – should solve this issue for the time being if you encounter it again.
Edit: Fixed for the next version.