Thread:Extension talk:Maps/Maps not working after upgrade/reply

This is probably caused by a change in the map type property names. If the broken maps have a maptype (I actually forgot the name of this argument, so it might be different) parameter, remove it, or update it to what is currently supported. In case they don't have such an argument, you might have a setting in LocalSettings that modifies the default and is setting it to something now invalid and similarly in need of updating.