It looks like %identifier% thingy and the way CMS Press sanitizes URLs, conflicts with qTranslate filter 'qtrans_convertURL'. In particular, after CMS Press installation for managing Custom Post types, all page navigation links displayed via wp_link_pages() behave like qTranslate was never installed.
I am really stuck now. CMS Press is kinda handy. But the site I make is multilingual.
Can someone look into the problem?