I too am running into the same issue. I have cerated three maps, all with significant points plotted with shape files associated with them. I can open them fine from both my desktop files and the online group I have set up for them but no one else in the group can. They get the same message as mentioned in the OP. The other users in the group have made sure they have the approiate system requirements. One of the maps is 485k and the other is 10M What information do you all need to help diagnose the issue? Due to the nature of the information on the map, unfortuantely I cannot share the map.
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