Hi Brad, thank you for posting in the Q&A forum.
I would like to confirm a few things with you:
- Do you see this behavior when trying to edit other documents (Word/Excel, etc.) in this library?
- Do you have unique permissions on the issued document that might conflict with your current permission?
- Does this issue happen only to you or also to other groups members?
- Did you see any error message in PowerPoint (client/Online) when you lose SharePoint permissions? What if you open the file in Read-Only mode?
SharePoint permissions do not get removed automatically on mentioned actions.
I would suggest you remove this account from the SharePoint group and grant it direct access to this site/library/document instead. Check if the issue persists after that.
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