Thank God for this thread. I've been trying everything from the old threads for the last couple of days. Glad to see it was possibly triggered by the patch, at least I'm not alone.
A few things I've noticed, don't know if they help.
- To me, it only happens when trying to travel to community lots. I can play my families and travel to each other houses just fine. Active careers lot also work normally.
- Going straight to build mode on community lots also work. It only fails when travelling there with sims (from either their homes or directly from the map), which kicks me back to map selection screen.
- If I select the faulty community lot after it fails to load, it says it's incompleted even though it isn't.
- It happened first when I tried to travel to Magnolia Blossom, where there are a few easels with incomplete paintings. Deleting them didn't fix the problem and the error occurs with every community lot, even the ones without easels at all.
- One of my sims vanished from my game and I doubt it's culling related since she was home with her husband and he's still there. I can't find her anywhere and she's not on her relatives, friends and club panels, although she still appears as alive on family tree. The loading problem first appeared when I was playing with her son's family,. I don't know when she vanished.