Indirik, I didn't mean that it wasn't a bug, but that the fact its a stronghold might be causing the bug because the code might be checking for whether it was a city. It turns out I was right. It's definitely a bug whether it had anything to do with strongholds or not.
BTW, Bowie, it would be appreciated in the future if when asking/reporting about a bug, you included what page you were on. I thought it was the banking page itself, which works, but then I realized the error text was slightly different and the issue was the link appearing on the Actions page. This should be fixed, pushed, and go live in the near future (within a day or two for my part; going live will depend on Tim's timing).
Oh and Bowie/Moderators, this should be in the Helpline forum. I had the hardest time finding this thread again when it wasn't in the correct subboard.
