Thanks for the confirmation. That's what I assumed, but I wasn't sure if maybe something fundamental about .90 changed that was making things different. I installed KJR and it didn't help, so until I figure out what I'm doing different I'm just using unbreakable joints and it's working fine. I think it might be the wings I'm using, I can't recall if I used the stock wings in .25 at all because I used B9 so much. I'll keep looking around for an explanation, but in the meantime I've sort of solved the problem, even if it is 'cheating'.