[dank reader]

I've been scratching my head for the past few days trying to understand just why my kobo would not load covers for epub books from calibre 3.6.0 and 3.7.0 after I replaced my Kobo (long story, short version, i broke my N905C and ebayed a pair of N905's)

PDF files are fine. Same with kepub loaded through the Kobo desktop app.
At first I thought it was the rom, so I downgraded the Kobo.
No version of the rom alleviated the symptoms.
Different combinations of loading documents singly, or in groups, newly converted or downloaded from humble bundle, all had the same issue. No combination of settings in kobo touch driver, the kobo touch extended driver or kobo utilities could get covers to load for epub files.

Checking the .kobo-images and koboExtStorage/images-cache folder showed
.parsed files were not present for the epubs, but are for the pdf files.

I eventually tried side loading directly to the SD card.
That worked fine.

Downgrading Calibre to 3.1.1 fixed it.

Which is wierd.

So to confirm, I'm running N905, with rom 4.5.9587, Calibre 3.1.1 (64-bit), windows 10 (1703), Kobo Utilities v2.60 and the kobo touch extended driver 2.8.2 succesfully. Calibre 3.6.0 (64-bit) and Calibre 3.7.0 (64-bit). Rom on the Kobo is definitely not an issue.

Is this an issue with Calibre, Kobo Utilities, or the KoboTouchExtended driver?