My older files are corrupted in some ways.
There are some strange spots around the mouth and I cannot add visemes.
(Even if I disabled everything in the inner mouth, nothing helps)
When I try to add visemes or face expressions, it goes to the neck or ear part of the figure.
When I zero the figure, the strange spots disappeare (looks everything just fine), but comes back by every expression change on the face.
When I try a fresh start with a new figure (from the scratch), there is no problem occurs with the face expressions or anything.