I never worked out why my score changed so much, now I know. But on the other hand ... if you want to crunch something else that gives good points try ABC for 64 bit OSs and Milkyway for 32 bit. I'm still trying to regain my World #1 in this project but don't think I can afford the number of PCs to challenge Mac. I'm at two dozen of the critters now and the upgraded air con struggles to cope with the heat load even in winter.