I'm having this same problem, I will travel with non-household sims to, say for example, the cinema small business that is owned by an entirely different household (that I set up expressly to run the cinema, and I have put them in unplayed households after that set up), and I will click on the ticket booth to select for all of the sims to pay for entry together, and only my sim goes in, while the others stay outside waving (as you have described).
The threads mentioned by rosemow are not connected to this issue.
I still have yet to find a solution to this issue, please let me know if you see anything to help and thank you! its soooo annoying!!!!
