Thank you for so quick reply.
Actually I was just kept trying to restoring the site and hopefully these info can be useful for you:
1) It(the backup) is only working for the version on the date of Sep 20th. (Not working for the later backups.)
2) I have also tried to update to the latest theme and the core, but no lucky.
I will wait for you to resolve this issue and try out again later on.
Thanks again for quick reply, I can sleep tight now.
Regards Graham
