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I might seems logical, but the SOPC builder must be clocked with the pixel clock, whereas I was using a faster clock. I'm a little bit surprised, because I thought the avalon bus needed a faster clock in order to transmit pixels and some others data in real time... and I thought that vid_clk at CVO was used to regenerate the correct video flow.
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The reason you can get away with using the pixel clock in some cases is because of the horizontal blanking interval. The average data rate for a line is actually a little less than the pixel clock.
However, I suspect you may still have some other issue in your system. You should be able to use an independent faster clock for the VIP components.
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