I went back six pages and couldn't find my exact issue, so I wonder if it's only me.

The seasons drive me crazy on vacations, so I've used Traveler to turn seasons off while traveling. Suddenly: script errors. Script errors everywhere, as far as the eye can see. Each and every sim, over and over and over again, automatically resetting because of script errors. Is this a known thing? Or might this be a mod conflict thing?

That's not the generally reported experience, no. Any chance we can see some samples of these script errors? There might be other mods in play that are expecting the seasons or weather of some sort to be present.

Here's one:

...is it showing up? I can't see it.

No, but I found the file uploaded to Script Errors on this site's FileManager. You have a mod by Inge Jones called "Beach Towel Fix" or something like that and it's demanding to know what the current season is in each error instance, but there is no current season. ErrorTrap is capturing those errors instead of allowing them to ruin/crash the game, but if they are recurring and happening on everyone in the world that isn't helping as much as removing Inge's mod or allowing seasons to happen would.

Can't say if there are other such seasons-dependent mods in play as the issues they might cause would all show up a bit differently and probably at different times.

Ah, I think I'd rather just keep playing with seasons enabled, then. It drives me nuts when sims decide that the perfect time to get some sun is when it's raining at night.

(Did the song Only Happy When It Rains just get stuck in my head? Why, of course it did.)