Curois

UB's "Suna Seni" comes to my mind. I had Valygar with me and also have stuck there. I've reloaded the game, then cluaed myself to the "tube" level, then created PPSUNA.CRE in front of main tube, then cluaed back and waited for Irenicus. Everything was fine.
If you don't have Valygar with you then it's smth else.


EDIT:
I don't know anything about repeating scene and Yosh's betraying and successful completing the scene.

Yippie! That worked! Thanks so much I'm glad, because I've been able to play this monsterinstallation so far without any problems. No major ones anyhow *raps knuckles on wood* Let's hope it stays this way.
Anyways, the problem seems indeed to lie with Suna Seni not being present in the cutscene.

Then, the scene started with the protagonist in the tube. (from a quick glance I could see that Yoshi was still in my party) And at the moment the soul sucking from the shadow thieves should start, nothing happened. My char just stood there in the tube doing nothing. Irenicus just stood there doing nothing. At some point I decided for fun to see what happened if I slinged some bullets at Irenicus. At that moment the whole scene started again, but this time with Yoshi betraying me. And then the soul sucking DID happen and the dream etc etc.
Is there anything that can be done about this?

i'm not sure what needs to be done for you: you seem to have got it working, thru an ugly but effective workaround.

Actually I don't, because in the end when I DO get the cutscene to start, Yoshimo suddenly left the party after all, even though he told Irenicus that the geas are removed. Also, as the scene starts again, Yoshimo apologizes for his betrayal and says there's no other way. So somehow, when the scene starts again after hurting irenicus, yoshimo's redemption through the mainquest of TS doesn't seem to have happened.

Thanks for the fix but I decided to install it again without FR-ROV this time. I can live without a bunch more of items

It CTDs after loading. So it loads fully and before I can see anything it CTDs. I could upload my ar0406.are and .bcs, but the ones in my override are the ones uploaded by seneas in this topic.

If you're familiar with DLTCEP, you can try opening the ARE in it and checking all the actors. I guess the problem is corruption of one or more CRE files referenced from the area file.

When you open AR0406.ARE, choose "Actors" tab, and for each creature try pushing "Embed it", then "Edit creature". Whichever creature fails to load properly and displays error message - is the culrpit. Even if it loads w/o error message, use "Check Creature" button to make sure.

I had similar problem with Adventurer's Mart. Some mod corrupted one of the actors inside (it was new merchant), and the game was freezing during area load. I used the method above to discover the faulty creature, and solved it by restoring the backup version of CRE file.

Good advice. I shall try that. The problem is, when the crash first occured, I dropped the ar006.are and the ar406.wed that Seneas uploaded elsewhere in this thread, in my override folder. They overrode nothing, so I assume those area files were stored somewhere in a bif right? When I dropped those files in my override, it changed nothing. The crash still happened. So that subscribes your point about the corrupt actors. The only question is, where can I find the original ar0406 files that are overridden now by Seneas' files? Aside from my crash-problem, if I manage to fix it, shouldn't I use the "original" ar0406 files that were used by my installation before I dropped Seneas' ones in my override? Because maybe Seneas' files don't have the same npcs in them as my original files have. Can you still follow me?

So basically my question is: aside from the ar0406 files I dropped in my override and overwrote nothing, that came from Seneas, where can I find the original ones? In one of the mod-bifs? or somewhere else?

It CTDs after loading. So it loads fully and before I can see anything it CTDs. I could upload my ar0406.are and .bcs, but the ones in my override are the ones uploaded by seneas in this topic.