
That's strange, I thought it might have been a birthday mod I installed but removing that didn't fix it. This one might take a while.
Also, what's a good present for someone's 930th birthday...?
Edit: Well, I found the cause but I have no idea how to fix it. For the time being I'm going to leave it alone.
Edit 2: Birthdays have been fixed by switching to a different mod to get colored names. I'm not sure if remnants of an old version of our old mod were causing a problem with the calendar or what but this mod seems to work just as well and it also fixes a problem we had with the old mod where searching was causing tons of errors.