If I move a unit into an unfinished tower of another player the unit gets stuck, can't move, can't attack, can't be attacked, I can't even select it!

Worse ever since this happened I can no longer move into any tower of another player, finished or unfinished.

I am not alone, I noticed another player in slow 32, Onurb, had the same problem.

What if anything can be done?

Well the reason that you can't move into an opponent's finished tower is that the tower doesn't belong to you. You have to own a tower to enter it.

Dunno about the unfinished bug, though.

I have read that you don't need to own a tower to enter it and prior to getting stuck I was able to enter other player's towers. Just ask tagart ;-)

It has recently changed so you can not enter towers that don't belong to you.