Yes I can fly in other places, and yes the fly button is grayed out...
"It's not easy to set hot-keys by accident. I'm guessing that the home key is the fly." I don't know how to set hot-keys, nor do i know what the home key is...
I have flown on this sim before the flight was turned off... but now, like two, or three, of those in the group with 'always allow fly' option on, can fly, at least two of us cannot, i'm not certain about the last person in the group...