linux_base-f8 doesn't support mathematica?

Mathematica works well with linux_base-fc4. Then I upgraded to linu_base_f8 since I want to use the linux flash 9 plugin to watch youtube. But mathematica won't open. So I have to go back to fc4 to make mathematica to work (of course,as a compensation, I cannot watch youtube).

I'm confused. I thought, as a newer linux emulator, the f8 would be compatible with older applications.
 
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