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It sounds like something is keeping the workbook from connecting to the external Tableau Map server. Does the mapload if you change Tableau Desktop to use offline maps instead of the Tableau (online) maps?
You can change the map settings by clicking on Map -> Background Maps -> Offline.
Additionally if this is only happening with the online maps, you should check out this article as it may be a proxy issue: https://c.na26.visual.force.com/apex/ExternalArticleTemplate?popup=true&id=kA260000000Gmmr