I'm not sure how helpful this will be...it's a dim memory. But maybe it will trigger a brighter one in one of the Calibre gurus.
I seem to remember - maybe when I switched from my old XP computer to my Win 7 computer - that "suddenly" Calibre wasn't reading some of my library folders. I got that "filepath too long" message.
I thought Kovid had said that at one time, Calibre allowed for a longer filepath name, but it had been changed. So it remembered it being okay on my old computer, but once I moved it to a new one, it was holding me to the new standard.
theducks mentioned making sure your Calibre executable folder is at the root level (e.g., F:\Calibre rather than F:\PortablePrograms\ThingsIUseALot\Calibre). Do you have your Calibre libraries saved at the root level, too?
Ultimately, I had to move my libraries out of some folders and bring them closer to the C:\ top level to get Calibre to read my libraries again. I just don't remember the details on how I had it organized before to give you a good example.
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