What build? Did you remember to (From the changelog)....
Code:
Required SQL (Your groups will break completely without this):
CREATE TABLE `group_id` (
`groupid` int(4) NOT NULL,
`charid` int(4) NOT NULL,
`name` varchar(64) NOT NULL,
PRIMARY KEY (`groupid`, `charid`)
)
ENGINE = InnoDB;
(Amongst a few other things)