Developmental Work:Pt.8

I started painting the weights today and I'm having a lot of trouble.  The biggest issues that I'm having are with the legs. Crouching doesn't work and when I try and make my model do the splits, his crotch freaks out. I moved the skeleton a bit and then this happened.

Im not sure how to fix this problem, since i can't undo it and i don't want to make it worse so I'm leaving it until a later time with the teacher so I can fix it.