I've had a repeat occurrence; this time on Karmic, and with the Region 2 DVD of Star Wars II.

as the previous poster says, it looks like dvdbackup doesn't send anything to stdout; presumably all the output we get is to stderr, which, as before, isn't very informative, only giving us the "Please send bug report - no VTS_TMAPT ??" message before quitting.

Time has passed:

rachel@mab:~$ lsb_release -rd
Description:	Ubuntu karmic (development branch)
Release:	9.10
rachel@mab:~$ apt-cache policy dvdbackup
dvdbackup:
  Installed: 0.4.1-1
  Candidate: 0.4.1-1
  Version table:
 *** 0.4.1-1 0
        500 http://gb.archive.ubuntu.com karmic/universe Packages
        100 /var/lib/dpkg/status

stdout output is empty.

Console output (presumably stderr), in its entirety:

rachel@mab:~$ dvdbackup -M -o . -i /dev/sr0 -v -n 'Star Wars 2' > dvdbackup.log
libdvdread: Using libdvdcss version 1.2.10 for DVD access



File sizes for Title set 0 VIDEO_TS.XXX
IFO = 22528, MENU_VOB = 694272
At top of loop
After opening files
After Menu VOB check
After Menu Title VOB check



File sizes for Title set 1 i.e. VTS_01_X.XXX
IFO: 131072, MENU: 582295552
VOB 1 is 1073709056
VOB 2 is 1073709056
VOB 3 is 1073709056
VOB 4 is 1073709056
VOB 5 is 1073709056
VOB 6 is 643905536
Bottom of loop
At top of loop
After opening files
After Menu VOB check
After Menu Title VOB check



File sizes for Title set 2 i.e. VTS_02_X.XXX
IFO: 18432, MENU: 917504
VOB 1 is 33290240
Bottom of loop
At top of loop
After opening files
After Menu VOB check
After Menu Title VOB check



File sizes for Title set 3 i.e. VTS_03_X.XXX
IFO: 18432, MENU: 233472
VOB 1 is 25176064
Bottom of loop
At top of loop
After opening files
After Menu VOB check
After Menu Title VOB check



File sizes for Title set 4 i.e. VTS_04_X.XXX
IFO: 18432, MENU: 827392
VOB 1 is 96466944
Bottom of loop
At top of loop
After opening files
After Menu VOB check
After Menu Title VOB check



File sizes for Title set 5 i.e. VTS_05_X.XXX
IFO: 18432, MENU: 827392
VOB 1 is 2564096
Bottom of loop
At top of loop
After opening files
After Menu VOB check
After Menu Title VOB check



File sizes for Title set 6 i.e. VTS_06_X.XXX
IFO: 16384, MENU: 827392
VOB 1 is 27650048
Bottom of loop

libdvdread: Attempting to retrieve all CSS keys
libdvdread: This can take a _long_ time, please be patient

libdvdread: Get key for /VIDEO_TS/VIDEO_TS.VOB at 0x00025830
libdvdread: Elapsed time 0
libdvdread: Get key for /VIDEO_TS/VTS_01_0.VOB at 0x000259ce
libdvdread: Elapsed time 0
libdvdread: Get key for /VIDEO_TS/VTS_01_1.VOB at 0x0006b072
libdvdread: Elapsed time 0
libdvdread: Get key for /VIDEO_TS/VTS_02_0.VOB at 0x00337c92
libdvdread: Elapsed time 0
libdvdread: Get key for /VIDEO_TS/VTS_02_1.VOB at 0x00337e52
libdvdread: Elapsed time 0
libdvdread: Get key for /VIDEO_TS/VTS_03_0.VOB at 0x0033bde3
libdvdread: Elapsed time 0
libdvdread: Get key for /VIDEO_TS/VTS_03_1.VOB at 0x0033be55
libdvdread: Elapsed time 0
libdvdread: Get key for /VIDEO_TS/VTS_04_0.VOB at 0x0033ee6c
libdvdread: Elapsed time 0
libdvdread: Get key for /VIDEO_TS/VTS_04_1.VOB at 0x0033f000
libdvdread: Elapsed time 0
libdvdread: Get key for /VIDEO_TS/VTS_05_0.VOB at 0x0034a811
libdvdread: Elapsed time 0
libdvdread: Get key for /VIDEO_TS/VTS_05_1.VOB at 0x0034a9a5
libdvdread: Elapsed time 0
libdvdread: Get key for /VIDEO_TS/VTS_06_0.VOB at 0x0034ae9a
libdvdread: Elapsed time 0
libdvdread: Get key for /VIDEO_TS/VTS_06_1.VOB at 0x0034b02e
libdvdread: Elapsed time 0
libdvdread: Found 6 VTS's
libdvdread: Elapsed time 0
Please send bug report - no VTS_TMAPT ?? 
rachel@mab:~$ 

There doesn't seem to be any more detail available to give. Sorry. :-)