I've noticed that the F key seems to have some issues once you unbind it from it's original (F- change POV) to something else. So anyone who's having the same problem that I'm having, where you unbind F from being POV change and set it to something else - you can't set a favourite. Might I suggest that you default all your keybindings, THEN set the favourites you want, then go and bind F to whatever you want afterwards, it will save your favourites. But bare in mind you'll have to default all your keybindings again if you want to add new abilities/weapons to the favourites menu in the future. But for the sake of 1 minute doing that every so often when you get a new piece of equipment, it beats going through the whole inventory and changing weapons that way. Hopefully this will help some people.

I can't confirm that you can rebind Q to bring up the favourites menu, but I'm not sure why you'd want to change that anyway as it's quite handy.

Hopefully this will help some people until they get a fix for it!