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But like I said, it is too small to tell from those tiny thumbnails.

Besides, if the JPEG file was incomplete, it probably would not even be displayable without getting an error.

Ok, before I prepare the files, I need to explain some things, because my workflow might be pretty different, than expected.
Usually I work with at least four animations at the same time. One regular animation project, with keyframes in default directory and three search animations, with keyframe files in subfolders (search01, 02, 03) of the keyframe folder. In order not to loose track of what is what, I do not have a main settings file, I store all the settings - incl. paths - within keyframe00000.fract and/or 00001 (the second one sometimes with reduced resolution, effects and subframe number).
So when you want to load the settings, just open keyframe00000.fract via "load settings", I will remove all asolute windows paths, so it should open with your default path settings.

So far I tried with two of my branches. one search and the project branch. I'll send you both. both should be rendered in full shader mode, as the detail level parameter is elementary part of my fractals. (Just go ahead and try with normal or fast - the results are not even close)
When my observation is right, the black stripe is bigger with frames, that render in shorter time, which lead to the assumption that there is a timing problem. But it's now up to you to interpret the results. Just to mention, that it doesn't happen to all frames but I never had 10 frames in a row, without something missing. Good luck and happy hunting - and feel free to ask, if you need additional information.