I ran few test rounds. Just to explain the situation. I was sailing with my nephew few days ago, did the Baltic mission, then headed towards Scapa. The atmosphere became so intense during infiltration that I actually forgot the game is most likely gonna crash. And it did. A second before the first torp hit the capital ship.
Anyway I ran few tests right now and here are the findings. When I was playing with pedrobas MMM the game crashed - MMM contains IRAI 0030 and upgrade to IRAI 0031, right?
Now I'm trying sober's megamod - also with IRAI+IRAI Upgrade. Same result as mentioned in the first paragraph. Crash before the impact, trick with staying on the nav map doesn't work for me.
When I disable IRAI Upgrade 0031 and leave just the IRAI 0030 basemod in the game runs flawlessly. I can watch from the bridge the torpedoes decimating the capital ship with all the fireworks etc. Turn around, fire the aft one, hit, explosion, objective completed - escape.
When I put new IRAI 0033 it works the same as stated above. Even when I put 0031 upgrade after 0033 I get no crash so that's a good news I'd say.
So - 0030+0031=CTD on my system, 0033+0031=stable.
However I have to mention that AI is rather passive regardless the IRAI version. Maybe I do something wrong, don't know really, but except some firing when I'm only few hundreds of meters from them I get nothing from them otherwise. When submerged they're shining at me or my periscope, but I never ever get depthcharged. I can do whatever I want around Scapa Flow
but I'd certainly prefer if they take me through hell and force me to fight for my escape.
If there's any adjustment I can change to make AI sharper I'll be happy to learn. Anyway the fact it doesn't crash inside Scapa is a success for me (and I hope for the others too), hope my findings will help to somebody.
Thank you.