Also, please specify what version of EPM Add-in or Analysis for Office you are using.
If earlier than SP26 patch01, please retest with this version or later if possible as a number of fixes to the behaviour of EPMSaveComment have been made in SP26 and SP26 patch 01.
Sorry, but without detailed analysis of the report I can't help!
Try to create simple test report, reproduce the issue and post the detailed info.
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