I guess the known bugs depend on where you look (these might just be for the MP game though):
There are several well-documented bugs in the beta.
INVENTORY CRASH BUG
This bug results in the game freezing or crashing when you attempt to use an inventory station. This is a known issue and is being addressed by the dev team. There is no definitive fix but one suggestion is to close any extra programs while running the game.
FAVORITES NOT BEING REMEMBERED
Some people are having problems with the loadouts not being remembered. A temporary fix is offered here: http://www.tribalwar.com/forums/showthread.php?t=318589
SERVER FILTERS NOT WORKING
Problems with the server filters are addressed in this thread: http://www.tribalwar.com/forums/showthread.php?t=317608
Some players will find themselves frozen in-game due to faulty speedhack detection code. A server can disable this check thusly:
# Remove read-only attribute on the file /program/bin/default.ini
# Under [Engine.GameEngine] add EnableCheatProtection=False
More info on running dedicated servers here: http://www.tribalwar.com/forums/showthread.php?t=317609
GETTING DROPPED FROM SERVER WHEN MAP CHANGES
Stat tracking and team registration are currently not enabled in the beta. Activating these features can cause you to be dropped from a server when a map changes. Fix: Under the Multiplayer Profile tab, leave Enable Stat Tracking and Enable Team Registration unchecked.