I'm pleased to hear it's not just me, sort-of.
It sounds as if my best bet is to convert the images as well as I can, and then do invisible tweaks to any files that don't display until they do display. Ughh...
Originally Posted by kovidgoyal
IIRC ADE has a bug that prevents it from displaying certain JPEG files. For example in calibre I found that JPEG files output by the Python Imaging library would often not display in ADE, while the same file if re-converted and output using Qt would.