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Chart images not rendering in ReportList thumbnails is a server configuration issue.

Desktop Experience server feature contains the WebDAV redirector:

Microsoft has created a new WebDAV extension module that has been completely rewritten for Windows Server >2008, Windows Server 2008 R2, and Windows Server 2012. This new WebDAV extension module incorporates many new >features that enable web authors to publish content better than before.

Please enable 'Desktop Experience' within the server features to take advantage of WebDAV.