I was trying to track down why I've never had a professor assigned to my sims at university or give the lecture class at the student union. I think I've narrowed it down to StoryProgression and Traveler (v85). SP is easy to fix, I just needed to decline to enable it when traveling to the UL world.

To test Traveler, this is what I did: I removed all mods from my Mods folder except nointromaxis and an Easy CASP mod. I left hair/clothing/object CC and Store content. My game is patched to 1.67. I have WA, Amb, LN, Gen, SN, Seasons, UL, and HELS. I started a new game in Sunset Valley, used a new CAS sim, gave him the motherlode cheat, and saved as "SV No Mod."

If I play that save ("SV No Mod") and have him enroll in university, he travels there and he DOES get assigned a professor at 3 AM Monday morning (you can see the professor appear in the relationship panel). That professor sims DOES show up to give the Tues lecture at the student union. (Then I quit w/o saving.) I always picked the S&M major, 2 week term, 3 classes in testing. I routinely deleted the scriptCache.package file after quitting while testing different mods but made exceptions when testing Traveler (noted below).

If I add Traveler (so that's the ONLY mod in addition to nointromaxis and the CASP package), play a few sim-hours in SV, Save AS ("SV Traveler Only"), exit, reload "SV Traveler Only," and enroll in university, then my sim does NOT get assigned a professor at 3 AM and one does NOT show up for Tues lecture. I didn't delete the scriptCache file in between exiting and reloading "Sv Traveler Only" during this test. The Traveler pages says to save before the travel interaction becomes available, I wasn't sure if that meant just save; or save, quit, and reload. So did the latter just to be thorough.

If instead of adding Traveler I add back all the mods I usually use including SP, enroll him in university, decline to enable SP in the UL world, then he DOES get assigned a professor at 3 AM Mon and that professor sim DOES show up to give the Tues lecture.

If I add Traveler, SP, and rest of my mods, load up "SV No Mod," play a few sim-hours, Save As ("SV Everything") in SV, quit, reload "SV Everything," enroll in university, and do not enable SP in the UL world, then he does NOT get assigned a professor at 3 AM Mon.

It appears to me that Traveler prevents assignment of a professor to my sims enrolled at university which in turn seems to mean that the student union lecture has no professor to lecture.

I also noticed:

If I load up my "SV No Mod" save without any mods except nointromaxis and the CASP package, enroll my sim in university and Save As at 2 AM Mon ("SV No Mod 2AM"), quit, add Traveler, delete the scriptCache file, reload "SV No Mod 2AM," then my sim does NOT get assigned a professor regardless of whether I save during that hour or not. Thus it appears that it doesn't matter whether Traveler was used when actually traveling to university, but only whether Traveler is installed at the point when the game assigns a sim to be a professor for that major (3 AM Mon). Also, see below.

However, if I add Traveler to my mods folder, load up SV No Mod, play for a bit, save, quit, reload, enroll in University, then save at 2 AM, quit, remove Traveler and delete the scriptCache file, then reload, my sim DOES get assigned a professor at 3 AM. If I save at 4 AM, quit, add back Traveler, delete the scriptCache file, reload, that professor sim will continue to show up in the relationship panel and give the Tues lecture. I don't know if it's safe to play the game removing and replacing Traveler like that though.

I haven't seen this issue mentioned here before. Apologies if this is known.

If one is going to test the transition system without traveler it's best to be a new game. Afterwards it's pretty much a game of russian roulette.

As for the error, I made the same booboo twallan did in the holiday code. I fixed that one for you, will silence mine too.

An update: I sent 4 sims to university again, disabled SP almost right away, and saved the first Sunday before midnight. Quit, pulled Traveler, and launched again. Let my 4 sims get a professor at 3am then saved and quit before morning. Put Traveler back. Loaded up and finished the 2 week term. I don't know if what happened next is related, but:

My sims got a second notice of the Meet & Greet at the student union on Monday at noon. They already had the Meet & Greet on the day before (Sunday) at noon. I didn't send any (they were at classes) so I don't know if the Meet & Greet changes to the student union actually occurred. The rest of the term was uneventful until the last exams on the last Friday. The academics tab said classes would begin again in 2 days and 17 or so hours later for all 4 sims. There was no "1 day left" message at 9pm, and my sims didn't get degrees or credit at midnight, and did not graduate at 1pm the next day. I think that's all supposed to happen on Sat - I don't remember my sims graduating on a Sunday before. So I quit, reloaded and tried again.

I checked Traveler settings, showed debugging, and chose the debugging option to show travel data. The output had this: "mCurrentDayOfTrip = 12" on Friday. I thought maybe that should be 13 (assuming the 1st Sunday was day 1 and not day 0) and since it was 12 maybe just playing another day would fix it.

And that's what happened. At 9pm on Sat I got notices that my sims had 1 more day, degrees were granted at midnight, and my sims graduated and returned home on Sunday like normal - except it was a day later than I expected.

So either I'm not remembering correctly about when this all usually occurs, or removing and adding Traveler back in reset some of the timing of university events. In any event it was interesting to see actual professor sims at the lectures and the occasional notices about my sim's performance in class. But not so much that I'll bother taking Traveler out and replacing it again. I expect to send the same sims to university again - they've been fairly consistent with spinning up wants for additional degrees. I'll leave Traveler in the next time and see what happens.

I just attempted to debug this and immediately when my Sim arrived in the University world he was assigned a professor in his relationship panel. Not sure where the 3AM component comes in?