It's not just you; I've seen a lot of double posts lately. FR has been slow and often when I go to post something all I get is a white page, so I hit the back button and try again. Sometimes the post goes through and you get a double post, and sometimes it doesn't. There's just no way of knowing.
I *think* I’ve figured out how to avoid the double post when you get the white screen...at least if you freep in several windows like I do.
Before hitting POST again, refresh your “my comments” page, and see whether or not the post shows up already...if it doesn’t, it’s safe to hit POST again.
Well I'm glad someone else is having the same problem, I've been blaming windows or my computer, I know FR been slow but haven't thought about blaming them. Been getting the same white page with some windows stuff on it.