I've had this issue in my game prior to several of the latest patches and the installation of Seasons. In fact, I first noticed it in a game save I started in early January. It's really odd when the children do it and their legs stretch out like play-doh. Talk about nightmare fuel! :grimace:
The workaround I've found in the meantime is by placing benches or chairs in front of the wedding arch. All the guests to the wedding in your household will remain seated while watching the ceremony if directed to sit in one of the benches/chairs prior to having the couple get married. If your wedding party isn't very large, you could also add the guests not in your household to a group with one of your played sims and direct them to all sit down. (Note: I'm not entirely certain whether or not you can create groups during a social event, but if so, it's a way to get some of the unplayed guests under your control if need be.) If you can't do either of those things, then the only thing you can do is hope the "dancers" decide to stay relatively far away from the wedding arch so you can crop them out of your screenshots. :lol:
