That's the whole issue. I don't know what I did specifically that messed it up. I'm very careful to take notes when I'm working on something so I can set everything back. But, the things I found that were wrong weren't anything that I had touched directly. I only noticed there was a problem months after I had last played with it, so it could have been anything that did it.
Ok, I've spent a bunch of time going through my notes and have a better idea of what happened. There are two things I know of that have been corrupted - RHD/LHD and vehicle make. These messed up my heated/cooled soft keys, gave me a default "UConnect" splash screen at startup instead of the RAM one, and replaced all my themes with a single default one.
Going back, I believe I have isolated how these got corrupted. The LHD/RHD is a result of changing the country code. At one point when I was trying to get DRLs working I had changed the code to Canada. Now I can't change one without it changing the other too. For the vehicle make, it looks like this is a result of messing with the "HVAC Configuration". Because I can't help myself from fixing stuff that ain't broken, I fiddled with this some time ago. I wanted to see what would happen if I switched it to ATC (spoiler alert: it's still MTC and the HVAC controls on the radio stop working). Now even if I switch it back, the value doesn't seem to be recognized.
So, these are the only two I know of right now. If you stuck to messing with only the seats and a few other things that others have done, you're probably OK. Just be very cautious in the future. For me, I think the AE is going to be retired from module configuration duty.