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Thanks Uninfamous. I'm still not confident I licked the problem. I tried to reset the new install of MakeMKV to write files to my original C:\Users\...folder - One I certainly have access to read and write in, and it started erroring again. I re-tried the solution above and found that when I install...

I know this is late to the party, but I just started getting this error, I don't know if it will fix it for everybody, but I got this to work on my Windows 10 PC. It appears to have been a corrupted registry. I simply uninstalled MakeMKV, then I went to the following Registry location and deleted th...