Menu display issues after upgrading to Sierra I just recently upgraded my Mac and it's having some issues.  It freezes for a few seconds, and when it resumes operation, things just go crazy.  Among other problems, some text is missing, some text is not showing up in the contextual menu. 

I thought it might be a font problem or something, so I went to Font Book, tried to validate all the fonts there, and all seems fine.

I hope the screenshots I attached might help.  Thank you.
I'd suggest a clean install... But when you choose to do it, don't forget the backups first! 

You could potentially troubleshoot it and find some corrupt file, but I'd cut the hassling and try a clean one (as it is easy to do and very likely to work).