@Hullu - can You ask the people reporting this problem which bot did they use when they experienced crash with Your optimized mm version? This way it will be for us more easy to focus on these bots and make tests for You with these bots making troubles with this mm version.
[EDIT]
BTW - since You are the first creator of Booster, can You look at it?
http://forums.bots-united.com/showthread.php?t=3760
[/EDIT]