Strage. It did for me 3 times. Once here and twice on a IPB forum.
*Edit*
Alright after installing it on XP and using it i noticed 2 things. This did not happen to me on XP. It was only Vista that doulbe posted. Very Strange to me on that.
IE8 starts off fast. On XP here it was great using it. Pages loded quick and everything. But now after an hour it seems to be locking up for a few seconds after each post and taking longer to load pages now. At the same time using more Resources. Not good. Time to file another report.