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Whats the problem? . You tested in WIndow and Fullscreen mode? Press "F" to go to fullscreen and try to export.

If the problem is related to the size(MB) and when you try to save the pic the word "download" appears in the name is due chrome is limited a 1.5mb per image. To avoid this use the "Batch export" just load the unique image you want to avoid this chromium limitation.

If not one of this cases, please attach a screenshot or a link to some video or how to reproduce the error/bug.

Yeah, that second one, I think that's it! And thank you, now I can fix this.

Incidentally, what's the upper limit on amount of files batch can handle?

No idea about batch limit, maybe none, i tested with around 60 files and worked, just needs time.