Hi!
After a clean install of ES and ED on a multilingual site (french & English), I have created some categories and set their languages to french.
Then I changed the ownership of the 2 initial ED posts to my normal account (was set superuser). I also changed the category language of the category where those 2 ED posts were located to french.
I thought I could see those 2 posts by my ES profile (Apps) but no: Error 500.
After some testing, if I change the language category of the category where my ED posts are located to ALL, no problem. I can see my posts by my ES profile and everything is working normally.
Hope this help.
Thanks!