No problems after the 04Feb16 patch until now. I'm getting error 533 again. If I delete an existing member of my household it'll save correctly. I've tried adding outside sims by household manager and CAS, then deleting them. That doesn't work. It has to be a sim already in the household.
I think the glitch is with one sim. She was asleep when I saved. When it boots, she's standing by the bed and immediately queues 'take a shower'. She must hop in then immediately out of the shower. Nothing will dissuade her. She's 100% clean. I even deleted the stupid shower! She still goes through the motions where the shower used to be. Resetting her will stop the attempt to shower, but it still won't save afterward.
So how do I fix a corrupted sim?
Correction: Going into and out of CAS (change appearance) allows a save. So, sort of fixed.