I've tried on an ipad (I'm mainly an android user, so had to dig up an ipad), and didn't have any trouble. When I first go to maps it asks me to login, which is expected because guests can't view the map. But if I login, then navigate around the site, read some posts, view some picts, then return to the map page I see the map properly. I can move the map around and zoom in on cities, etc.. I have to wonder if the issue is caching related specific to your device? It's strange that it's happening on both your iPad and iPhone, unless when you first access the site there was a problem with a javascript file or something, and you downloaded bad versions to both devices. (I'm just speculating here). In which case clearing your caches may help as it would force a fresh download of those files..