I have installed, removed, reinstalled, updated (at least tried; the updates often fail) {repeat variations ofthe actions} all to no avail. Whilst I can get PowerDVD to play DVDs it just will not play Blu-Ray discs.
I have checked the (I)nformation, which informs me that PowerDVD 12s version is 12.0.5522.55 and that there are no updates available.
My wife's laptop, with a built-in Blu-Ray writer, also running PowerDVD 12 will play the Blu-Rays, so why won't mine?
Additional information:
PowerDVD loads. On attempting to start playing a Blu-Ray, a progress bar is displayed, then disappears. All I get then is a black/dark grey flashing display within the PowerDVD window. On some previous attempts (see 'repeated' comment above) the 'this Blu-Ray doesn't support mouse use' dialogue box was displayed, but that seems to have ceased, and when is was displayed, it didn't display correctly, being just a white box until I cleared all windows from the desktop and then reinstated the PowerDVD window.
Graphics are nVidia, and are up to date.
OS: WIndows 10 Pro, April 2018 update.