Im on vive/kinect360 and had problems with the legs getting stuck to one foot but that is because of how VRchat handles binding the avatars onto the trackers i think.
Avatars that have very skinny feet that are very close together when in t-pose seem to be almost impossible to get to work right.
An avatar that has its feet wider apart binds easily.
Ive noted that if the avatar i try to bind has proportions that are differ much from standard humanoid it tends to break and get mashed into a ball.
Ive also noticed that i need to walk using the touchpad after binding for the tracking to start working.
The latest update helped a lot with getting the feet to bind correctly and the legs to not cross when looking to the sides, very happy about this.