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First, could you please verify that you're running 2.50 or later of Vizard. Starting with those releases some texture/text handling problems on ATI hardware have been resolved. There are no known issues with nVidia hardware and we currently consider nVidia our baseline for performance.
Our ATI tests are done on Radeon hardware using the latest Catalyst drivers. Could you please verify your Catalyst drivers are the most recent, and if so, then can you try on a different ATI chipset?
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