BD Rebuilder Stream Freeze

[denfi1]

Trying to backup blu-ray movie using BD Rebuilder and I encounter a problem in that the BDMV/Stream freezes at about 1hr and 45 min into movie. FFD Show MPEG 2 enabled, VC1 set to wmv9. Running win 7, amd quad, with 8gig ram, asus blu-ray burner and using Image Nurn. Any suggested will be appreciated. BTW using quality media.