For over a year I have been using NDI output from Easyworship to vMIX. Everything was working fine then two weeks ago I suddenly got just a black screen in vMix when I tried to use a Powerpoint EZW. Yet songs and scriptures shown in EZW still output absolutely fine via NDI to vMIX.

I am running everything on one computer and our church does not have a spare. I know desktop capture is a workaround but it is far from ideal as the full screen PPT display cover up views of other software. 

Is there a definitive solution to this problem as I see many others have reported similar issues?

If it worked correctly for over a year and suddenly started having this issue 3 weeks ago the logical solution is to determine what changed in the week prior to the issue started. What software updates did you install? What hardware did you change. 99.9% a sudden problem like this is due to a change or update. And unless you decided to update to a newer version of EW 3 weeks ago (and the latest release of EW came out in November of 2020, 7 months ago so I seriously doubt you suddenly decided to update to that, the issue is with whatever change you made to the software or hardware of your computer. Revert back to the previous version of whatever you changed and you'll more than likely fix the issue.

Thanks for that response. That potentially eliminates EZW as causing the problem but I was hopng for some more specific help on what other software might have caused this problem especially if other users have experienced it. It is likely both McAffee, Microsoft and Vmix products have been updated and who knows what else goes on in the background. I do not know how to 'roll back' a system so hoping that someone else had experienced the problem and found the solution. 

McAffee is a joke and should never be allowed anywhere near a computer. It's essentially junk and causes too many problems. Windows 10 built in Defender is considerably better overall and unless you are a big company the average user would never need anything more.

The main updates that would cause issues would be Vmix or OBS (depends on which program one uses), NDI, MS Office/PPT, and graphics drivers.

VMix releases updates on a regular basis. They just released on a couple of days ago as well as one about 3 weeks ago. You might want to go to the Vmix forums (found on the Vmix website) for information on the best way to roll back to a previous version as well as help with your NDI problem.

https://www.howtogeek.com/235474/how-to-roll-back-builds-and-uninstall-updates-on-windows-10/

Yes, this was fixed by a. EasyWorship upgrade. I did not know so many update were available because the 'check for updates' function in EZW was not showing anything. When it looked through the info on various updates a fix to this problem was mentioned so I just updated to the latest version and it is fine now. We are running on one computer though. Hope this helps. Roy

in my chruch computer, using gpu gt730, sending ppt through ndi alternate screen show blank in obs

but in my home computer, using gpu gtx950, work fine

so my solution is install ndi application, and turn on ndi screen capture in easyworship computer

and the obs computer capture 2nd monitor / live screen of the easyworship computer.

also i notice that if the computer cannot sending ppt through ndi alternate output

ndi screen capture hx also will now working, because hx using hardware decoder, but the non hx using software decoder

gt730 in easyworship work fine with song, and play video 4k, sending to alternate ouput 1080p ndi.

only problem sending powerpoint in easyworhsip.

for powerpoint work fine if using ndi screen capture.

i will check powerpoint gpu setting again later.

  A GT 730 can barely handlebasic text with simple backgrounds at 720p without motion backgrounds, no foldback or alternate output displays, but not at 1080p. It simply doesn't have the graphics power to handle anything after 7.1.4.2, and definitely not for alternate output. The GT730 is actually worse that integrated Intel Graphics.