The only difference between this installation of Windows and the previous one is that I updated the graphics drivers, so I uninstalled the latest drivers and then installed the drivers from the previous Windows install. Sadly, this did not resolve the problem either
EDIT: I just restored my Windows from the image that was working. OMG!! The Same error is in the log file, but DVDFab is working correctly. So obviously this error is a red herring.
So I have no idea why reinstalling Windows killed DVDFab.
Both Windows are Windows 10 x64 19044-4412 with the exact same versions of the exact same programs.The only difference between the two installations was the GPU driver, which didn't fix the problem
Why would re-installing Windows kill DVDFab? It was a clean installed on a formatted SSD, not an inplace upgrade.