Acrobat cannot access the network. Please verify... when saving back to SharePoint

When I open a document from SharePoint, edit or without edit, then choose the SharePoint/Office 365 -> Check-in, I get an error.  The error is "Acrobat cannot access the network.  Please verify your computer's network connection and try again."  This happens even if I immediately do it after opening it from SharePoint, so there is no change in the network.  This occurs for everybody in our organization.  It is SharePoint 2010.