I then have to Ctrl Alt Delete out of the program and try again to load the disc. Eventually after around five tries or more the loading bar will go all the way and the disc will load fine.
This happens on all versions of PowerDVD I have tried (including the latest trial, and also on two different Blu-ray drives.)
But.... ArcSoft Total Media Theatre software doesn't have this issue at all. every Blu-ray disc loads first time, every time.
Why would this be?