1. which language are you trying to add?
2. if you suspect the theme being the issue, temporarily switch to another and try to add the language
3. try temporarily disabling some plug-ins, and see if that makes the problem it go away.
Chouby,
I just updated to 1.8.3 and all my Pages are back 🙂
I’m marking this one as Resolved.
Tyvm for the quick fix!