Linksys has received my configuration file for 2.0.04 and this is an update on what has so far been discovered.
Some have reported that leaving the "cookies" box unchecked is allowing cookies. This would be true because you are not enabling QOS. Once QOS is enabled the X2000 then blocks the cookies and you would have to place a check mark in the web filtering "cookies" to allow them.
It is likely there are more issues and it would be wise to wait to update your firmware from 2.0.03 . There will be a new release sometime soon according to Linksys. Thanks to all who have called them to report the issue.
In addition to other 2.0.04.007 problems described in this thread...
The pop-up window at Setup -> DHCP Reservation doesn't show any information. The reserved IP address for my main computer seems to be working. The router hasn't issued a different address since I installed the firmware, but that pop-up screen doesn't list any reserved addresses, or show any devices at all for that matter..
Also the Status -> Local Network -> DHCP Client Table contains no information. Normally this would show the currently issued addresses of all my computers and my wireless DVD player. It just shows the column headers and doesn't even build a table.
I'm surprised Cisco is allowing these issues to just hang out there without some sort of remedy.