This happens to me at many locations, not just the Arcane keep.  And it's a very serious bug in that it totally prevents you from battling in manual mode, not to mention it's very aggravating having no idea how your team is doing until the battle is done.

Yeah, not just Arcane keep. Here's a pair I snagged. 

Minataur:

i

Ice knight:

i

Devs, mods, any comments?   While the battle can proceed on auto, you lose the ability to be manually specify attacks, which can be important at times.  And it's certainly aggravating to not be able to watch the action.

Is this acknowledged and in the queue to get fixed, or do we need to post more screenshots for this to get taken seriously?