If you mean the keyboard shortcuts aren't working, check [gear icon] -> Keyboard shortcuts. Maybe an add-on is messing with your paste keybinding. You can even

If you mean the keyboard shortcuts aren't working, check [gear icon] -> Keyboard shortcuts. Maybe an add-on is messing with your paste keybinding. You can even click the little keyboard icon in the search bar, and when it says "recording keys", just press cmd-V and it will filter down to things that use that. If you mean right-click -> paste isn't working, then I don't have any ideas.