Change Flotilla or Uboat results in crashes.

[AndreasT]

Hi, I am a returnee to this wonderful game after a bit of a break. I did stop playing SH3 since I had some issues with the game. Crashes and such, but I can't really remember the exact problems.
I restarted playing recently, about two months ago, which worked well until now with no issues. I am now however unable to either change the flotilla or change my U-boot. The game stops running when my career is loading, saying there is a problem with SH3.
Does anyone have a suggestion on how to solve this problem? I am using GWX, with the Hsie and Stiebler fixes, a few mods and the Ahnenerbe Gui.
Still, besides these problems it is fabulous to play this game again.