Hi Omar! Thanks for taking the time and visit the links.
Finally I replaced the DNS of the client’s domain with my server’s DNS until we figure out what’s going on with his server.
Everything seems to work fine. Just one thing, maybe you can help me:
After installing CircleFlip I have problems with the session. After a while WP logs me out and it’s hard to log in again, I’m working with the browser in private mode. It has to be something related to the cache.
Any clues? Can a theme make this behaviour to happen?