SSRS 2012 not rendering charts in a PDF (A generic

I have a data driven subscription that renders the report in PDF. SSRS 2012, Win 2008 R2 (on Hyper-V) is used.

I have looked in ExecutionLog3, the shared data sets all successfully refresh, the reports successfully render and are output to the correct folder.

I did read somewhere that when rendering the reports in IE that the user needed permissions to the Temporary Internet Files folder, however I don't know if this is valid for data driven subscriptions? I did add the execution account (a local user) to have read/write permissions on the ReportServer temp internet folder.

Apart from this I have no idea what to look for to troubleshoot this issue? Any suggestions will be welcomed.

EDIT - 2012-11-19

Have found the following unhandled exception error in the ReportServer log:

ERROR: Throwing Microsoft.ReportingServices.ReportProcessing.RenderingObjectModelException: , Microsoft.ReportingServices.ReportProcessing.RenderingObjectModelException: A generic error occurred in GDI+. ---> System.Runtime.InteropServices.ExternalException: A generic error occurred in GDI+.
   at System.Drawing.Image.Save(Stream stream, ImageCodecInfo encoder, EncoderParameters encoderParams)
   at Microsoft.Reporting.Chart.WebForms.Chart.Save(Stream imageStream, ChartImageFormat format)
   at Microsoft.ReportingServices.OnDemandReportRendering.ChartMapper.GetImage(ImageType imageType)
   --- End of inner exception stack trace ---;

It turns out that the GDI+ drivers needed updating on Windows 2008 R2 Server and is a known issue. If you want to know what version of GDI+ you have then do a file search for gdiplus.dll.

I posted the same question here and got a response saying to update the drivers via a hotfix, which can be found at this link, and it provides the version of the gdiplus.dll that will be installed with the hotfix, so you can compare if there is a version change necessary.

You need to request the hotfix, and an email will be sent to you giving you the download location.

This also solved the issue of images not rendering as well as charts