Wow - quite an interesting thread.
I can chime in here and definately say that I too remember the final shot with the photo. I saw the film three times in New Orleans on its original theatrical run. After just reading this thread, I finally threw in the DVD to check out the ending and that red coda feels totally new to me. There has to be two different cuts of this.
And before everybody starts calling me senile and throwing other movie titles at me, let me just make it 100% clear that I am specifically speaking about TAT. I have never even seen BTTF3 or any of those other films bandied about here. My memory is specifically about TAT and the ending I remember it having - not some other film, so please don't waste your time thinking of similar films to toss my way.
It appears that no home-video or taped-off-tv copy has the 'photo ending', at least from what we've seen here. Thus, it makes me think that some or all of the original theatrical prints contained the photo ending. That would most likely be where I saw it, because I don't believe I've ever watched it on video or tv all the way through. No one here has a theatrical print handy?

I know an early poster said he used to own a print, but that doesn't verify this debate either since he no longer has it so that also just comes down to another person's memory. And for all those who never saw the film theatrically, how can you say that the photo wasn't there? And for those who did see it theatrically and don't remember the photo, maybe it's just your memory at fault? Or possibly after seeing the altered version so many times over the years on video and tv, you don't remember that the theatrical prints originally ended with the photo. See, it can work both ways.
Maybe a revival theater will scrounge up an old print someday and someone can check that out. Just revive this thread in a few more years or so. Maybe this mystery will be solved eventually - or maybe not.
And, finally, if that photo ending never does show up in any form ever again and can never be proven to exist, than I solemnly agree to check myself into a mental hospital. Because that photo WAS there, dammit! I'm absolutely sure - I think.