hi to everyone who will read. my problem is this : during a repology , 2 edges of my face are become undelatable and i can’t use the vertex of them . it’s seems like frozen . so it’s a bug or i can fix this problem? i post an image
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and other 2 edge have the same problem 
tool>masking>clear mask
that is the only Idea I have for you. if you have a mask you can’t effect those areas