Oh! Thanks for that tip.
I downgraded to 10.0.4.8, and now it works!
It was stuck for about 3 minutes at the same place 10.0.5.1 was stuck (10.0.5.1 showed 0% in the main window, 10.0.4.8 shows Processing)
0m 07.53s: blu-ray FDB2551AE042778A5F2FFB1F91232FC3FF8B41AC
0m 08.08s: cert BEE=0x00 same
0m 09.44s: D 94AA8B12
0m 09.44s: got vuk
0m 09.76s: got unit key 7
0m 09.78s: blupath: movie disc
0m 09.94s: Get BluPathData and RRdata
Then suddenly it continued.
3m 06.81s: blupath first run: region A, unknown playlist
3m 07.03s: Get BluPathData and RRdata
4m 07.83s: blupath second run: unknown playlist
4m 18.78s: Java protection is removed by StealthyClone anti-protection.
4m 19.23s: got bdmv
4m 24.58s: stream(27,3,6)/clip(27,3,4) infos are not the same, using clip info to regulate it.
4m 25.29s: got extended bdinfo
4m 25.29s: opened blu-ray
4m 25.29s: Blu-ray Copy: Full Disc
4m 25.29s: Source: D:/BDMV/
4m 25.29s: SourceSize: 33029 MB
4m 25.29s: RemoveHDAudio: 0
4m 25.29s: OutputSize: 46100 MB
4m 25.29s: OtherSize (CLPI, JAR, etc.): 258 MB
4m 25.29s: OutputDisc: BDMV
4m 25.29s: OutputTarget: BD50
4m 25.29s: OutputVideo: 1080p/i
4m 28.14s: Output group estimatedblock size
4m 28.14s: video cannot be compressed
I left 10.0.5.1 trying for a few hours, so I don't think it would eventually recover.