Storyline 360 - PowerPoint import not working

I am having these same issues with my PowerPoints. And, I get issues with Presenter 360 in my PPTs that just stops working and flashes an error every time I click any Articulate feature on the ribbon. 

I have Office 365 downloaded and stored on my local hard drive using Windows 10. I have the PPTX on my local hard drive. I have never been able to import a PPTX into Storyline...I either immediately receive an error or it starts and hangs. Then, I can't get it to cancel. Then, when I try again, I just get an error.

Yesterday, after losing all of the audio in my Presenter file for a 65-slide deck, I uninstalled Office, uninstalled Articulate360 and all the apps, restarted and installed them all again. Presenter seems to be working fine (for now), but I still can't get Articulate to import the PowerPoint files. I receive the PowerPoint files from a graphic designer who works on a Mac and saves them as PPTX. She shares them with me over a Dropbox drive, and I download and save them locally. 

I've opened a case and the engineer never has any trouble with them. So, I'm left thinking my next option is just to upgrade to a new computer and try again. I had lobbied for us to do this work in the Articulate suite over iSpring, but now I'm not so sure. Any progress on these issues?