I have a dual language page with portolio entries. But somehow i get a 404 page if i switch to the english language for the portfolio pages.
If i uncheck Translate custom posts slugs (via WPML String Translation) in wpml translation management under Custom posts slug translation options. The links work again for some minutes until the 404 Pages show up again.
Page link:
http://www.heinzstampfl.ch/projekte/
Version: 2.3.2