Resolved
Reported for: WPML Multilingual CMS 3.1.7.2
Overview of the issue
Thumbnail do not display
Due to issues with WPML Media 2.1.5 (fixed in 2.1.6), some thumbnails may have disappeared or could be shown in the wrong size (full size, most likely).
Workaround
If you face this problem, from our testing, we have found that a thumbnails regeneration plugin such as Regenerate Thumbnails helps fixing this issue.
Again, updated versions of WPML Media should not cause this issue anymore.