The problem came along with the latest SMF forum software security upgrade and also depends on browser version. IE 11 does not display the map for example. The Member map is not an SMF product, it is an add on, known as a mod. Mod's often break when changes are made to the basic forum software. At times a mod can cause the SMF software to break. There is a "fix" available but it involves manually changing lines of code. I hesitate to do things like that as that can cause other problems at some future time if SMF or the mod vendor makes a change/update that is not compatible with the manual changes that were made. Mods can be cool, even useful. They can also be a source of frustrations.
The Member Map mod is no longer listed on the SMF mod site. Maybe it has been removed while being fixed or updated.
I don't know.
As long as the map continues to function in some browsers my plan is to leave well enough alone. If a new version is released then we can give that a try. I like packages that don't need a manual admin intervention best of all.
Thanks for pointing out the issue Rick