If I fall onto the top of another avatar's head, I will become stuck in the falling animation and unable to move my avatar. Entering flight mode returns control of my avatar. However, if I fly up and fall back down onto the head of the other avatar again, I will become stuck in place with falling animation and unable to move again. This process can be repeated an unlimited number of times. I have used both scripted and unscripted (manual control) methods of positioning my avatar over the head of another avatar. I have also tested this with an avatar wearing no objects at all. I am not sure when this bug first appeared, but it is recent - within the past few weeks. Setting this issue to Major since it affects one of my products, MystiTool.