I noticed that http://emc.jdhallows.com/ is now offline. My suggestion is to update EMC's live map to include smp switching like the one JDH had. I used this a lot to locate resources in the waste (well, above ground anyway) on servers that I am not currently on.
It is working for me, possibly you reloaded in a server hiccup? If that fails delete the browser’s cache. but yeah, it would be good to have these features in the official version
It seems to happen because the app requests a non-SSL-encrypted version of the live map url (http rather than https), whereas the page itself is SSL-encrypted. Perhaps some browsers don't mind this, whereas other browsers block it. It would probably be possible to fix this fairly easily (although JD Hallows would have to do it, who I can't currently find on the website...).