Calling multiple maps on a single map can cause issues, in order to render multiple maps I have to ensure I call new instances of each map requested from google, that the page won't load another map after it runs mine doesn't surprise me, and yes equally it could be something as simple as a naming conflict, although I have attempted to keep my naming conventions quite unique to avoid isssues.
I really needed detail from you not Godaddy, as in what page are you referring to in all this? a BP groups members list, a members account screen what UPM settings are / were you using, where on the page was this events map trying to render it's own map.
Contacting the other developers isn't an option at the moment, I'm sorry about that but the nature of my plugin is a very basic approach to providing maps for a BP enabled site, it's not the best written plugin in history :) and really has to be taken as is, I haven't added a donate link on the plugin as I never intended it as a major work thus the hours that have gone into it have been without recompense and I can only spend time on the plugin when it doesn't interfere with paid work or as recently when someone commissioned me to add features to it (fed through to the public release for all)
What you could do is leave a link to the actual page on your site that is displaying this events map so I can see their map in action.
Lastly and this may come across in the wrong way :) but have you contacted the other plugin and enquired with them, after all you have said my plugin works ok but there's on the same page doesn't so it may well be an issue with their method of calling maps that needs adjusting rather than anything I can actually do with mine. Not saying this is the case but it's possible.