More Awesome Than You!

When my sim arrives at the hotel she can pick a room fine (but for some reason, sometimes it says Key.../Take key from Bittany) but can't actually walk up to the counter and check in (the bellboy dude can't be selected). When she leaves she simply doesn't pay the bill.

I took out my entire downloads folder to make sure it wasn't a hack, but the problem persists.

Any help would be lovely...

Never seen this and have no idea how this could happen.

"Key / Take key" sounds like you may have an old door locking hack.  Some of these let you assign "keys" to different sims.  I believe all such hacks are outdated, and could be causing a problem.

Do you remember having one of these hacks?

Perhaps Tunasiafish's smart doors?

yes it is an old hack for locking doors with keys. I had the same problem too just remove them all from your downloads.

I did have a door hack at some point, they should be gone by now though. All hacks/hacked objects have been removed from my game. Problem persists.

I also noticed I can no longer call a taxi while on vacation.

EDIT: This problem seems to be limited to a single family. Don't know if it's got anything to do with it, but it's a sim I made in CAS and exported with SimPE. If I create a sim in CAS and take him on a vacation the game behaves)

If you clone a sim in SimPE and export it back into the game, you should re-clone the newly exported Sim in Bodyshop to ensure residual crap is removed.  Straight SimPE clones do not always behave well in game.