During my tests for my app. I have found out that having blank covers mean that there is either a badtag in the xhtml of the file, the file format is not the same has the extension or the size is bigger than around 2000 pixels in height. Also pretty often the FULL file is only created when you put it to sleep the first time.
I would suggest that you open your files in sigil to fix some bad formatted xhtml. Remembe that the kobo uses not only the cover file, but also the hole stylebthat is present in HTML and that can cause error.
By the way there is 5 files now 1 is 600 x 800 and is for the sleep cover.
Last edited by Nigol; 12-10-2011 at 10:50 AM.
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