Can't browse images

Hey i am busy with a client’s site. I have wordpress Seo by yoast, redirect 404, contactform7, smush it and WPML installed beside nextgen. My prrmalinks are set up as %postname%. First i got qtranslate and nextgen worked fine, but with another language the translation linked to page not found. Now this issue is solved by using wpml, but nextgen gallery links to page not found or 404 when i want to browse the images. I cannot find the option
“The album will not link to a gallery subpage” as described in other threads. I also cannot find a reset button or anything like that. By uninstalling and reinstalling the plugin, the last settings are adjusted.

Any ideas? Would appreciate it very mich cause i have to deliver the site tomorrow!
Cheers, Tatjana

http://wordpress.org/plugins/nextgen-gallery/