2 new installs -- map works on one and not the other

I’ve just installed piwik on two different domains I manage – the map shows on one and not the other.
Both are hosted with the same hosting company, running the same version of Apache, PHP and mySQL.
The only thing I can see that I did differently – the domain where the map doesn’t work is for a lady in Australia and the host servers are in Chicago, USA. I set the time for her site to be Perth, AU as that’s where she lives. Other than that, I set both up exactly the same – except for database names, user names and passwords. (The time for the domain that works is set for Chicago.)
Other than the map not showing on the site for the lady in Australia, both setups appear to be working okay.
Any ideas?