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Premiere CS5 preview problem
HI everybody. i have been googling abt my problrm, and it seem that no one is experiencing this.
When i have file in my timeline rendered, it preview crap.
this is my print screen:

this happens to every footage i import.This is PAL 720*576, progressive 25fps, aspect of 1.09 sequence.
although it preview like this, the exported file is fine.
My sys config is:Win 7 64bit, Q6600@2.4Ghz 4Gb ram and
ATI radeon HD 4870
i know that mercury dont support ATI. is this being the problem? anyway i can disable mercury? i dont need it anyway if this is the problem. CS5 is more peacful to work with than CS4.