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I tried both of them. Still only a black screen. Possibly there's some kind of incompatibility with my mac.

Anyway, thank you very much, sincerely, for taking the time to help me. Probably I'll content myself with other games for awhile, and now and then play around with the setting to see if I find a solution. If I ever find one, I'll post it here.

Thanks again so much for your help.
Crispy