If you see any of these on the server, please destroy them.

They are responsible for the many crashes on FTBU lately, and have been banned from being placed/built.

map reset? Jesus... we just got to radioactive bees...

They are solely responsible for the crashes on a daily basis

http://www.minecraftforum.net/topic/90855-solved-remove-mod-generated-blocks/
This might get rid of em all if you know what ID's they use.

Well, at least the why of the crashes has been found. Thanks for that Broonie