I've built a self-hosted site for a client (using Modernize theme) here.
We have recently discovered that the updates he has made to the site since October 2012, using his Mac at work, have never been published live to the public. When he makes an edit to the site using his Mac at work, the changes show on the front end of the site in several browsers on his mac - so he has been content that everyone can see these changes.
Following a disagreement with a 3rd party over what his own website stated/showed, and then checking on a smartphone, he has now realised that the changes he makes on his site are only updating and showing in browsers on his Mac. If he logs into the site as himself on a different PC or Mac on the same LAN network at his place of work, he has the same issues.
I can happily make changes to the site as administrator and they are correctly updated to the site for all to see. I have tried disabling all plugins then getting him to attempt content updates - to no avail.
We have no caching plugins installed and I've shown him how to enable Safari web developer tools and to disable caching and to empty caches - again to no avail.
Can a wordpress user account become 'corrupted' or similar? He was set up as Editor together with a single modification using the 'user roles' plugin so he could edit the main menu, but as I've stated - nothing changed wen we disabled plugins. I've changed him to Administrator and it has no effect upon the issue.
He has sent me a screen grab of the revisions panel at the bottom of a page which shows many changes to that page since May 2012. Wen I login and view the same revisions panel, I can only see the revisions up to May 2012.
Finally, I wanted to see if I too experienced the same problems on my computers if I was logged in a him. i.e. login using his UN/PW details. However I'm unable to do this as when I use the details he assures me are correct they simply do not work at wp-login.php . It seems that only he can login using those details on his Mac at work.
So I have a feeling his user profile/account is compromised/broken - is this possible? In the meantime I will set up another editor profile for him to try.
Appreciate any suggestions.