My website hidden link is in french buy default and i'm actually setting WPML on it to have it also in english. Since several weeks I don't know why but I got a recurring error 500 on the website and WPML is the cause.
I don't know when exactly but when I work in the backoffice and udpate some settings, WMPL change the .htaccess file.
As you can se in the two screenshots, twio lines in the file are changed :
RewriteBase / become RewriteBase /en/
and RewriteRule . /index.php [L] become RewriteRule . /en/index.php [L]
I've seen in the forum that I'm not the only one who have this issue that can be server related. I've desactivated translation of the login page (I don't use it anyway because i have a custom login page) because I saw it could be the cause of that problem but it didn't change anything the issue keep coming back.