For peoples who have a multilang website and use YAMS it seems it doesn't work correct on EVO 3.
Dennis the person who took over the original repository had a look at it but can't find a solution.
Something with cache, sometimes it shows the wrong page content while the alias is oke.
When a page does not display correct content, a corresponding docid_xxx.pageCache.php has been created in /bootstrap/, but the corresponding-cachefile in /cache/ is not created.. instead a wrong cache-file causing duplicate content:
/core/storage/bootstrap/
/core/storage/cache/
Its a warning for the ones who use YAMS.
If anyone with programming skills knows a solution or would like to have a look I do have a copy of a site on EVO 3 with the strange behaviour.