The MacOS Apps currently being the official ones on einstein@home have been built with a version of boinc code that is somewhat obsolete now, especially with the 4.43 advanced client. It has only been tested that the computation of the old Apps with the new client works, but the graphics will only be limited and may not work at all now (e.g. there is no way to close the graphics window again in the old Apps once you opened it...). We are currently working on a new set of Apps which should come out this month, the new Mac App will work properly with the 4.43 advanced client, too. Sorry, there's nothing you can do right now, the work is up to us.
BM

Mac(PowerBook G4): problems with "celestial sphere"
)
Jean,
you may want to look here. This currently requires a bit non-Mac-like fiddling around, but the App should work with the new BOINC Manager and the screensaver module.
BM
BM