Now I'm missing thumbnails/and previews in 2017.

So now after resolving several other issues, I'm missing my thumbnail previews. All I see is the Corel Icon. I've tried a repair install, I've tried uninstalling and reinstalling Ghostscript and the Windows Shell, restarting after each step. I've tried reassociating the file type in Windows. Nothing. Each time Corel releases a new version, it seems I have to fight for days to get the program usable. This is probably the worst release since X4. Can anyone help so I can start doing my job and not trying to fix the software I purchased?