Is the problem browser specific? You mention IE but I use Firefox, on Windows.
I didn’t mention it before in case it was a silent deletion by a moderator. I don’t post on boards much, so I sometimes bump against user rules that I don’t know about.
Like the “no politics” rule on Chowhound.com, where my longish essay on turtle cookery was deleted because I’d named my three food turtles Bush, Cheney, and Rumsfeld. I left after that.
Did you see the post on the site before it disappeared? I can’t speak for all the Mods but we almost never delete posts except if we believe them to be spam. If an existing member in good standing puts spam up, we will usually edit the post and/or give a public warning rather than simply deleting. (Immediate deletions and banning happen with newbies who post spam).
Otherwise posts can be edited or deleted if they fall afoul of one of the other rules. This happens very rarely, except in the case of copyrighted content which often has to be truncated.
So I doubt that it was a Moderator action. But it would be good to know if the post ever was actually uploaded properly and then disappeared later, or if it simply never uploaded properly.
As for browser specificity, I’ve only heard the problem happening with IE. I will send a message to Alan who knows more about the specifics here.