I seem to be in the same boat Vladel. I was able to play 300 #2 BluRay, but not SinCity2 Blu-Ray, not 3D.
Kept getting the 'update' which was quick 'ping' on internet connection and update confirmation, then 'update' again.
I looped through that for awhile and ended up registerring 3 times in the process.
Finally got out of the update loop and BluRay would load all the way up to 99% and then at 100% would error by freeze Power DVD10.
I pass all BluRay Advisor except 'network'. I run an off-line machine with 'dial-up' access.
and pass all 3D Advisor except monitor (display) I wouldn't watch 3D anyway.
I was able to watch 300 #2 with no internet - initiated the BluRay with high speed internet, but failed due to non-digital monitor I had VGA monitor hooked to SDI adaptor into digitalvideo card. Brought machine home and used digital SDI cable to monitor and watched BluRay fine.
So, hope you come back Vladel for possible advice. As for myself, I plan on purchasing sample BluRays and taking my machine to high speed interent on week-end to see if some kind of fix happens.