Saving document Errors when using PowerPoint Add-in

Hello - looking for some answers to an issue we are seeing when saving using the Power Point Add-in.  This does not happen all the time and we can not determine the cause.  Once we have created our slide and done work to format the information in the proper charts and may have been able to save previously, we begin to get an error message that the document is not able to be saved and everything seems to lock up causing the need to reboot the computer and that file that was created can no longer be used.

Anyone experience this and have answers/solutions??  Much apprecitaed!!  Thanks

As an additional comment - this issue seems to occur when using the Filter option in the Add-in.  Everything seems to wrok and save until selecting the filter option.