[Bob Malahowski]

Assuming the blu-ray burner has worked in the past:

Close Encore
Open Control Panel
Type the word “troubleshooting” in the search
On the left side after the search, click open view all
Select “Playing and burning CD’s, DVD’s and Blu-ray discs” and run the troubleshooter to determine if your burner is recognizing the media.
If the burner is not recognizing the media, but is otherwise working ok, then you need to check to make sure the burner is compatible with the discs you are using.

I ran into this problem trying to use a BD-R LTH (Low to High) disc in an older burner. I had to go an buy some BD-R HTL (High to Low) discs instead (TDK produces some decent ones). Documentation on what is or is not compatible with a particular burner is sometimes very weak.

Hope this helps. This is an old post, but I sure the problem still crops up from time to time.

Bob M