I had a long call with a very good member of Adobe Tech Support. I mentioned to him that this solution from the Adobe community (below) had worked, but was curious what he thought-
1. open device manager
2. find "display adapters" this might also be called "display drivers?"
3. right click on the Nvidia video card
4. click "disable device"
5. open elements
6. reopen device manager
7. repeat step 2 and 3
8. click "enable device"
The Tech Support guy felt that you needed to restart your computer to get the Nvidia video card working again. He felt that I actually was just using the Intel Graphics card, despite re-enabling the Nvidia card and that is why Adobe Premier Elements was working.
Given that my Nvidia card is much more powerful than my Intel Graphics card, he wanted to get that working. He took over control of my computer and checked a variety of things, but in the end, he felt that the Nvidia Graphics Card drivers from March 2018 and April 2018 were not compatible with the current Adobe Premiere Elements 15. So, we went to Device Manager, select Display Adapter, select the Nvidia card, update my driver, browse my computer, let me pick, picked the old May 2017 version. That fixed it. Initially, we tried the old March 2018 version, but that also had a problem. We had to roll back all the way to May 2017 version and that worked.
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