I am also currently trying to create my first Blu-Ray disc, I'm using single layer Blu-Ray so 25GB.
I'm using Toast Titanium 11.0.6, the same as Thomas has done, dragged 'pro res 422' files over to a 'Blu-Ray video' disc setup. Total of 2 video files.
I burn it, which takes some hours to encode and burn. When I review in a Blu-ray player the menu links to the first file and plays correctly the first file being 98 mins.
Then when I try to select the second video on the menu it goes to a black screen and then returned to the main menu after 10 seconds. 00:00:00 is displayed on the player at this time.
I have reviewed the disc on my macpro as well as a separate disc image created of the same project. The file I'm trying to run is on the disc but the menu is not linking to it and running it correctly. I am using "Mac Blu-Ray player" to review on MacPro.
So far I have tried,
A fresh project in case of any corruption on the project file etc.. No luck.
Burnt to a normal DVD as a normal "Video TS" file, and the menus linked correctly to the videos.