First check if the black frame is there in the timeline, you will have to look at maximum magnification because tiny gaps are tough to spot in premiere. When you find it either stretch the clip to fill the gap or right click the gap and choose ripple delete then re-export.
If not, then it is just another of premiere's little characteristics, re-import the exported file and trim out the black frame and re-export making sure you untick "recompress" in the export settings.
Cheers
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Edius Pro 4 Broadcast, Edius DVX, ADVC300 -- PremPro 2.0, Matrox RT X100
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