Add frame and most of the other right click options in the Animation frames and Animations windows seem like they can't be selected, but clicking on them works normally.
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I can't reproduce this, they appear fine here on Windows 8. Can you provide any more information about your system and whether this occurs on any other computers you have access to?
After restarting a couple of times the bug seems to be gone.
Can't reproduce anymore, it happened right after upgrading from 108.2 to 109 and creating a new project. I checked an old project and it was the same there too.