Originally Posted by Yoths
Ok, I've found the problem. It has nothing to do with *.opf/*.ncx files and their format!
The modified EbookReader aborts openning an epub with the error 'Invalid page', if the font for that epub is set to another than 'Original' and there is no section <fonts> in the reader.xml
(I commented it out to get SONYs original fonts set). If the section <fonts> is present, everything works well!
That's just the kind of "breaking things" I want to avoid, like I mentioned in my previous post! Apparently, the check that is supposed to fall back to the stock fonts when the custom fonts aren't specified isn't working as it is supposed to. Thanks for reporting back!