I have a fairly new BU40N (1.04MK) that has not been used much, it ripped a test UHD without issue when I flashed 1.04MK, but today with Pacific Rim Uprising it locked at 0.5x on the main rip so I aborted. I had "0=99" in the Windows registry, removing this made no difference. Popped the disc into my ASUS BW-16D1HT (running WH16NS60 1.0) and the disc immediately spun up to full speed and got a complete rip without issue.
Is this just one of those weird things that happens?
Running makemkv 1.15.4 on Win10.