I also have the same issue; however I nearly always put my book though the polish and/or convert epub->epub before sending to my device, so I seldom have the wrong thumbnail.
But yeah, sometimes I just send a "raw" epub, and the wrong cover appears on the device. When that happens, neither the book from the device nor the one in the Calibre library have their first page as the correct cover (in the viewer).
I thought it was just an option somewhere I didn't check, but apparently not...
Edit: and no, no DRM. Mostly FFDL-generated epubs from before I discovered the Generate Cover options (genius, by the way). Some GrabMyBook epubs. That sort of things. Everything else pass through the Convert tool at one time or another, so the cover fits.
Last edited by aleyx; 10-22-2013 at 02:27 PM.
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