Hello,
a while ago we decided to drop the fancy urls. this created urls for all posts with endings like showthread.php?t=2343465475
because old links were saved with the
seo friend urls inside them, they will not work now and there is no simple/automatic way to fix this. i am sorry about the inconvenience.
however, the link you pointed out is definitely messed up, but that is probably because of the original posted, we never had this code inside our urls: !m3612!