I have several S4 Revolutions in my current show. The first time one of them moves in the show, the display adds an F in the channel attributes section of the tombstone view. This makes perfect sense to me, since its the first time it has a value. Whats funny is that as I hit Blind and Next/Last through the cuelist, the F attribute flashes on for a brief second and then shuts off. This only happens in one cue at the start of the show, so far as I can tell. It's not effecting functionality, its just a quirky thing I thought you might be interested to know.