Just ran into it again - no bills paid.
I'm not paying close enough attention because I don't expect it when it does pop up, but it seems to me that when I manage to save after a 533 error (after going to manage worlds or transporting to a different lot) that when it reloads it's a mixed save. The location is correct, but everything else is as it was on the previous good save. So my child sim maxes a skill in the evening, I get a 533, go to a park, successfully save. When I reload the skill is back at where it was on the previous good save, my child sim is at the park where I saved last even though she should be in school (at 9:30 am), and the day is the one I got a 533 on. That's if I'm remembering correctly.