Masking only work for one instance in 12.01. Win 10 LR 12.01

Masking only work for one instance in 12.01. Fresh Lr. Create a variety of masks for a drawing (OM-1). It works. Move to new image. Masking no longer works. Must restart Lr and it will work on the image it did not work on before. Then it no longer works. You get one shot.