DO NOT USE - HIGHLY UNSTABLE
The issues were never fully resolved as the players also hatted the system.
Every time a player attempts to gather a resource or get or use a BOD, there is a 1/1000 chance that a captcha gump will appear to test if they are AFK or not. This will occur a maximum of one per hour. Each time the player fails a captcha a naughty point is put on their account. These points decay at the rate of one per day. If a player reaches three naughty points their account will be suspended until all naughty points have decayed.
Unzip the contents into your ServUO directory, merging directories. This should not overwrite any files unless you have a previous installation of this addon.
Edit the file Config/AntiAFK.cfg . The file is documented.
This addon is based on Capthca! Anti-AFK checker by Praxiiz with contributions by Hank.