We have the exact same issue happening - I've reinstalled Microsoft 365 and tried on both easy worship 7 and 8.  We've spent 3 hours trying to get Power Point to play through EW7 and EW8 today but have had no success.  It just hangs, all other slides work but power point will always fail.  I see it starts power point through the Windows task manager but It's like EW doesn't acknowledge or take control of that slides so it doesn't do anything.

Using EW 7.4.1.9 - Schedules with PowerPoint ran well every day (twice a day, 6 days a week, 4 times on Sunday) since February when this new MSI Windows 11 PC meeting EW advanced PC and GPU specs was installed.  We are running PPT from Office 365 for Business - En - US.  Ran the 13th Sunday in Ordinary Time EW schedule at the vigil Mass on Saturday (June 27) evening with no issue.  Sunday morning, (June 28) EW seems slower than normal and froze when slide deck was advanced to live view and would not show up in live output window.

Rebooted - no change; installed all updates and rebooted - no change; ran Office 365 online repair - no change; switched to twin MSI back up box with its own instance - no change;  created a new schedule and and added a PPT that ran well last month - no change, now hangs.  If I try and get back to EW slides, the delay is at least 16 seconds.  Our workaround today was to convert the PPT to *mp4 and upload it.  

Interesting..I'm using EW 6 and the same thing happened...starting yesterday (June 28) PPT doesn't work in Easy Worship at ALL...graphics work, movies work, but no PPT work at all. We don't have Office installed; we used Open Office up 'til a few months ago, and have been using Libre Office since then. However, everything was working until Sunday. 

We have the same problem as the users above,   since this weekend. No go live with Easyworship!   Also big issue for us so please help!!