Hi there. Since my Kobo died I've been using Calibre Companion along with Moon+ Pro to read my books. Although it's been working great so far, I've been encountering CSS rendering problems with Moon+ that aren't present in other eReader apps.
One major problem that I have with it is some text alignment don't work.
I'm really not an expert with coding apps and such, but I do understand basic HTML and CSS. One thing I found out is it seems that Moon+ ignores a global justification rule. Some centered rule paragraphs are also ignored. I had to manually add text-align: justify; to every class that are supposed to be justified in the CSS file.
Here are some screen shots.
The lighter background is Moon+ and the darker one is Cool Reader (the same as Aldiko). I also tried uploading the books to my Google Playbooks account and the books are fine there.
I can't post the book file because of copyright issues and I can't extract a page or two because I'm away from a computer right now. But if anyone of you would like to take a close look, drop me a PM and maybe we could figure something out.
(just a note... The option to disable CSS in Moon+ is unchecked.)