As for the '_showLocationPin' error, showLocationPin is a variable from EventsView.js. It is used by DrawMap function which has one parameter - mapIndex. The error you are getting could be thrown only if you are using ExpandableListMaster.ascx external template for EventsView control. Otherwise the DrawMap function is called internally from EventsView control in SetItemMetadata method. Note that this function is used to show Geomapping data - Geograpthic map for Events.
The problem could be result of some interaction with other java script code you have on a page, so other control like Images and Docuements module in mode Lightbox. You can also test in different browsers.
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