I'm having that problem with Firefox in Linux. No problem in Windoze. Trying to access http://forum.videolan.org This works: User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.17) Gecko/20110420 Firefox/3.6.17 (.NET CLR 3.5.30729) This doesn't: User-Agent: Mozilla/5.0 (X11; U; Linu...