people having problem with N900 not working on PS3 after pairing:

solution is quite easy...

just set your standard controller to OTHER than no.1.

have had this PS3 bug quite often, lots of games have controller isuues when the controller active is not set to No.1 in a game.
as result, controller will work half, moving around in games work, but all buttons are dead.

when the normal controller for your PS3 is set to 2,3,4. the N900 will be set as controller no.1 on the PS3, solving this stupid (PS3) bug.

I doubt that the BlueMeamo itself can do anything about it, but its easy to solve by users this way.

-- edit--
initially BlueMaemo did not work at all for me, after setting PS3 controller to 2 and repair all seemed to work fine.
however, after reboot/disconnect the devices can be reconnected in BlueMaemo but nothing works , gui comes back but controls just not responding..

only a re-pairing solves the problem (temp until app closes)