Game freezes when getting married

Getting married is impossible. I've tried the ceremony and the wedding arch: options are greyed out and claims the other party isn't there, while standing right next to eachother. Eloping via the arch: the same. Eloping on the other SIM results in the wedding march music. The sims just stand there. There's an option in the pie menu to "exchange vows" and the message board updates, but nothing else happens.

I've tried several options, including traveling to another lot as a group, one by one, breaking up first and proposing again, with and without mods, Starting a new game, Creating to sims from scratch. Relationship bars are at 100% both friendship and romance. They are part of the same household.

The only way to get them into a marriage status is via CAS, which kind of makes this game obsolete.

I've bought this game and some EP's about a month ago. From the 400+ hours of gameplay, I've actually only played about 10 hours. The rest of the time I was fixing bugs! This game should have an "early access" status and be about 90% cheaper to justify its performance. And please don't lauch EP's if the basegame is still heavily bugged.