anesthezea, you mean a select all/none in the library screen for bulk editing? Also, the OPDS browser lets you bulk download books, it might help. One more thing, I've found that iFunBox tends to copy files much faster than iExplorer.
Putting the cover file next to Marvin doesn't help - the cover must be in the book. Sometimes, seeing a cover in calibre doesn't necessarily mean that it is in the book. On the other hand if exactly the same EPUB file shows a cover in iBooks but not in Marvin, then it is something I can fix. Would you send me an email so we investigate this/get it fixed?
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