and also this tip

[ "Missing Security Token"
For those of you who have been having this problem with the forum lately, please clear your cache and cookies and you should hopefully no longer experience this issue after doing so. It appears to have been isolated to a batch of firefox users, and should have been corrected. Please clear your cache and cookies, etc
__________________]

the thread here has more helps if needed-
http://www.reduser.net/forum/showthread.php?t=35654

and if we can't get it figured out Please send a PM to DocJohn.