I fixed a problem preventing Calibre conversions... it should be fine now. Uploaded v2.
For the record, the problem was as simple as this: In almost every .xhtml file I had:
Code:
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:ops=" http://www.idpf.org/2007/ops">
Well, the space in
xmlns:ops=" http was the culprit.