I would try encoding your video using different settings. Are you encoding VBR 2-Pass, VBR 1-Pass, or CBR? Also, keep your max bitrate at 27 mbps or less. For excellent quality, you can set a target of 25 mbps.
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Thank you!! I used CBR now at 25. I had used Vbr 1 I guess and as you mention...I made sure to run every single program as administrator and disabled UAC. Why hadn´t I heard that!!!?? Lesson learned!!