@sparilis and @champion_hustler The travel transition is fragile and can break easily, although disappearing plumbobs is an unusual symptom. In general, it's best to save, quit, delete your cache files, and reload after your sims arrive at their destination, to free up RAM and other resources that might not have been released from running the original world. For reference, the cache files are:
- CASPartCache.package
- compositorCache.package
- scriptCache.package
- simCompositorCache.package
- socialCache.package
If you use mods or don't mind adding a few, NRaas Traveler replaces the EA travel transition with a much more stable version. Having Traveler, ErrorTrap, and Overwatch (also from NRaas) greatly reduces the chance that the save will break during travel, and ET and OW do a lot of useful cleanup in general.
However, I'd be worried about a save where sims regularly disappeared from the portrait panel, even if the problem consistently resolved itself. I don't think I've personally seen that happen in years, at least not for more than a split second as something was loading. Are there any other signs of corruption? Does the save run well overall, or do you notice excess lag or stutter, or other performance issues?
Additionally, if you use mods, please list them, unless they contain adult content, in which case just list the creators so I know which ones you mean.