sims teleport up/down stairs and all actions queued are canceled
I had this happening but the patch before the last kit did fix it for me. So it could be a couple of things.
First thing I will suggest is to repair the game. If there was some sort of hiccup during your download, it could have corrupted and/or not installed correctly.
Before restarting the game after you repair, delete your localthumbcache file too. I also suggest you start a new vanilla game with no mods to see if the problem is still there. If it has gone away, then go ahead and switch to your main save and see if it has cleared up there too.
If the problem has gone away in a vanilla game but still shows up in your main save with mods, it is probably a mod interfering. Lots of mods got broken by the patch and a lot of them still need to be updated. So check on all of them at whatever site you got them from and if you've got one or more that have not been cleared as ok for the patch or been updated, remove those and see what happens. Then for those that you can't find an answer on if they are good with the patch or not, start putting them back in a few at the time until the problem shows up again. Then get rid of the one that is causing the problem. Just keep doing that until you've tested all you mods.
Hope this helps.
