I have reviewed through your description and have run through some local testing of this behavior, however have not been able to replicate the behavior you describe above. As such I would recommend submitting a case in your customer group as a next step for additional investigation by the next available member of our support team. When submitting the case if you could please include the following information it should assist with their investigation.
1. An example PPT file that is causing the behavior
2. Does this occur with other file types (.doc, .xls, pdf) or is it limited to PPT files
It seems to only happen with PowerPoint files other office type files are fine like Excel and word.
They work great actually.
I have one great example that has this problem consistently , however it's most likely confidential.
I will have a look what I can do as far as a example.