I made an upgrade from 2.6x to 2.7.0. I put all files excepts :
- all files in the directory config/
- all files in the directory template/
- the directory attachments/
- the directory images/
like documentation

After connexion to backend, i can't configure anything because when i click on "Configuration Generale" or others items, nothing appears.

Maybe a problem with ajax ?
If you have any ideas ?
Thanks !