found a WELL easier way to do this peeps
when u load ur server up, go to the M2Server ( i usin 1 called l2server atm)
on the row @ the top go onto view (2nd 1 from right) then go onto list it will open a window then on the top row of tabs, click the 3rd one in from the right and it will come up with 2 lists, the left is the mobs that wont disapear and the right all the mobs in the DB, click on the ????(A) button to transfer all ur mobs in the DB onto the left and that will stop them from disapearing, then lick on the ??(S) to save it