Hi Mickael,
I've been playing with 1.2.6 and I noticed a bug : whenever there is mixed content in one of the OPDS sub-catalogs (as it happens when a list of books is broken down by letter, for example, and some letters only contain one entry : the entry replaces the letter link), EPUBReader does not find the sub-catalogs (the letters links in my example) but list them as if they were books.
Here's an example :
http://davidsoft.free.fr/calibre2opd...og/catalog.xml
Use the "All books" subcatalogs.
If you need more details, please mail me !
All best,
David.