Hoi Elaine,

I would first reduce or disable code compression in JCH Optimize tool. It should always be first step in all investigations. There is a high probability that compression has corrupted the map display code.

That did the trick, thanks!

1. You're welcome
2. Have you renamed htaccess.txt into .htaccess ? If not, you have the reason.

Never give up, if you still have chance. Holland has still strong Joomla Community :)