Single black frame in enhanced podcast rendered in GarageBand.

When a podcast created in Garageband is exported or shared with itunes, the resultant  .mov and .m4a are jpeg w/aac and will have occasional black frame at a chapter marker.
The chapters  are created by droping  images into the podcast track. These tiff images created from grab captures of screen shots. The audio is an mp3.
Anybody have any suggestions or ideas of cause?
OS and iLife are uptodate.

Hi there, thanks for your advices. Unfortunately, none of them worked out.
The problem must be at some point where the screenpast part gets rendered out of Premiere. I recorded the screencast in Camtasia, rendered it out as an MP4 with H.264, imported the clip to Premiere, editetd everything together with other footage, and when exporting it out of Premiere (no matter what format), it all got messed up.
So I did the screencast again, the settings where the same and "suddenly" (well, after hours of swearing and rendering) the black frame was gone after the Premiere render. Still don't know what the actual problem was. Just hope it doesn't happen again because it's such a waste of time with all the rendering.

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    http://i.imgur.com/g4P5iM1.png
    http://i.imgur.com/zDOIwrC.png
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