New Rig disfigures the Butt

[Willymack]

I just updated WW and now all of my Sims Butts are disfigured at the base of the crack. These are all different skins so it's not the skins. I also noticed the Butts look weird now for many animations. This is very bad as I am a Butt Man and I want my Sims to have the old butt not this disfigured Butt.

[xXSniperWolFFXx]

Im Having the same issue, I believe it is something with your rigs, im looking through all my sliders and rig files in my mods folder to delete old ones. It's a pain in the ass.