Hopefully just a temporary glitch, have seen a few reports on the main forum too. But when I load up the map editor, I only seem to have editing rights in my AM area, places I have driven are no longer showing up as editable.
I had that last night at about 12:30 and thought - “my three months are up” - but then - “they can’t be, I was there only last week!”
It was all fine again when I logged in this morning, and it seems to be OK at the moment, for me, so I think it’s just a temporary glitch. Try logging out and logging back in.