Is there another issue with the YITH wish list plugin or with WPML? I get a 404 when clicking the star in the navigation bar in the second language, while visiting that page in the primary language goes well. Changing the language also displays the wish list, as the URL is different than when you click on the star in the navigation bar…
Changing the language on the wish list page => en/wishlist/ => OK
Visiting the site in that language & clicking on the star in the navigation bar => en/wishlist/view/?lang=en => 404 => removing as from /view => OK (URL as above)
I think it is since plugin update to 2.0.5.
Cache clearing or permalink regeneration did not change a thing for me.