Well, for the White Screen of Death (or whatever you all are calling it), from my own experience, I have found that [b]NOT[/b] refreshing the page will prevent double and triple posts. Instead, I usually just close the page and reopen RPG. After a few minutes, my post will appear. I don't know if this is common knowledge or if this even covers the problems everyone else is dealing with (after I started doing the above, I really haven't had any issues with the white screen), but I wanted to throw in my 2 cents.

Also, follow the warning text that appears above the text book. :D

Edit: Wow, when I posted this, I got a "The Server is Down" message. Considering the content of this post, it would have been quite embarrassing if the error caused me to double post. :lol