Bug

A bug is an error, flaw, mistake, failure, problem or fault in a the game that prevents it from working as intended. This may include things such as graphical flaws, spells not working correctly or features not working properly.

Bugs are often fixed in Game_updates. If you find a bug you can use the /bug console command to report it, or visit http://support.guildwars.com for more information. http://support.guildwars.com/cgi-bin/guildwars.cfg/php/enduser/std_adp.php?p_faqid=2079 has specific information on how to report a bug.