I've got a WordPress 3.4.1 site that I can log into fine. I'm on Windows XP running Firefox 16.0.2. The owner of the website is on a Mac running Safari. I created a new user and they cannot login user those details. I've also added a new plugin (SEO by Yoast) and again they don't see those changes. It is as if it is loading a cached version.
I can log in with my iPad, but the owner cannot log in with theirs.
Any idea why this would be happening?
We've also tried installing Firefox on the Mac and the same problem occurs.
Thanks for any advice.