Yes , I ran cleanup and repair ,also told my antivirus to make an exception of DCS . I ran the game, but it started in the map view and I could not fly from the cockpit.
I tried pressing F1, to no avail. So I un-installed it re-started the game ,re-installed it only to get the same dis-abled message .So I'm back to square one. All my other aircraft are working fine, it's just the F4, but looking at some of the replies I'm not alone. It's very puzzling .