I have a really odd problem in AD20 where the standard menu bar (the one with File, Edit, etc) has disappeared, but only from my schematic editor! Even odder is that when I use a keyboard shortcut to open a menu (e.g. Alt+e for the Edit menu) Altium shows the menu for the PCB editor, even though I'm in the Schematic editor.
The image should illustrate what I mean - I'm in the schematic editor, but Alt+p has open the 'Place' menu, which should only be shown in the PCB editor!
I notice other people have had similar issues, though none of the fixes seem to work for me (deleting preferences etc.).
Any ideas?!