I moved an army into a tower that was disappearing (because the player quit). Now, when I click on the hex, it indicates the army is there, but I can't "grab" it to move it or attack with it. I do get the options to disband, transfer, or to go into defensive mode.

I note an opponent of mine also has an army in the tower opposite the castle gate. I assume his is stuck as well, or he'd be using it in attacks we're having.

Slow 18; turn 23; position 107,48; Scouts_2.

The tower disappears in two turns. I'll report back what happens then.

it allways happens 2 me..i once had 3 stacks stuck in a fellas towers

u just gotta wait till it dissapears or take it over.

Yes, that happened to me too, but not with a dissapearing tower, but a enemy one, i think i recovered my unit when i took the enemy castle.

Just happened to me... now i'm without archers lol

wouldn't it be more correct that IF we already have units inside a tower, of a player that "ceased" to exist... that that tower should "pass" to the player of the unit inside?

When the tower is gone you will have access to the troop again, another way to retrieve it is to transfer it out into another.