I created a unit named askdjhaksj. Things worked fine for a while, but eventually it became unselectable. It's icon still appeared on the cloth map, but it stopped reacting.

The debug.err file is at: http://pastebin.com/m284d3beb

Later in this game, I moved into a hostile city, but no combat happened. I saved and was about to try to reproduce, but it crashed on load. It looked like these issues had already been reported, but I didn't see any other reporting of an unselectable unit.