PPTX upload process failed

[OisinRiley]

I'm actually using office automation on Win7 64-bit with PowerPoint to manipulate PowerPoint presentations. A PPTX was uploaded from the internet and the process failed. I opened the PPTX directly with PowerPoint and got the error "PowerPoint found a problem with content" and asked if I wanted to repair. I said yes, saved it as another PPTX, and everything was ok. This happens only with this one file.

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I've unchecked all the protected view settings in the trust center, set my computer to authentication and impersonation to connect and identify, enabled macros and Active X controls, added the upload path to trusted settings, right-clicked the PPTX, properties, but there is no "unblock" to unblock. Nothing has fixed the issue.

What else can I check or is this just a bad PPTX since it's the only one we've found like this?