The only reasons for the map not loading are 2:
1. Js error on the page (most of the time caused by jquery)
2. Broken ajax response (most of the time caused by improperly configured cache plugins)
The easiest way to debug this is firebug -> you turn it and look for the error messages and try to correct them.
Since I can't see the page I can't see what error messages you have and there is no way for me to tell you what might be not properly configured on your site.
Please start a private ticket and provide me access to that page.
script-1.2.js - is part of jomsocial. Jomsocial also includes jquery -> they do something that breaks google maps -> as you can see from the output the problem starts from the jquery code.
Can you for example try to disable the mod_hello on the hotspots page to see if this will solve the problem? (i think that the mod_hello is the only thing that includes the jomsocial js right now, but if it isn't try to disable everything that includes it - just for test - we need to isolate the problem first before I can offer a solution)