ULTRAVIOLET - main title "skipped due to navigation error"

[hdb3.net]

all 'extra' titles identified and rip correctly however main title is missing, possibly because "Title #1 (1:24:18) was skipped due to navigation error"
(DVD - ULTRAVIOLET - sony cdr36206 - uk1-36206-st vfc 91072))
media error unlikely - disc copies OK with brasero... plays OK in VLC, mplayer, though fast forward breaks...
[first post - apologies if inappropriate etc]
the log says:

Using direct disc access mode
IFO file for VTS #2 is corrupt, VOB file must be scanned. This may take very long time, please be patient.
IFO file for VTS #16 is corrupt, VOB file must be scanned. This may take very long time, please be patient.
IFO file for VTS #17 is corrupt, VOB file must be scanned. This may take very long time, please be patient.
CellWalk algorithm failed (structure protection is too tough?), trying CellTrim algorithm
Cells 1-32 were removed from title start
Cells 82-82 were removed from title end
Navigation information is invalid around 0:00:07 - check output file for AV sync errors
Navigation information is invalid around 0:00:08 - check output file for AV sync errors
Navigation information is invalid around 0:00:08 - check output file for AV sync errors
Navigation information is invalid around 0:00:09 - check output file for AV sync errors
Navigation information is invalid around 0:00:09 - check output file for AV sync errors
Navigation information is invalid around 0:00:10 - check output file for AV sync errors
Title #1 (1:24:18) was skipped due to navigation error
Title #3 has length of 1 seconds which is less than minimum title length of 120 seconds and was therefore skipped
Title #4 has length of 14 seconds which is less than minimum title length of 120 seconds and was therefore skipped
Title #5 has length of 46 seconds which is less than minimum title length of 120 seconds and was therefore skipped
Title #6 has length of 34 seconds which is less than minimum title length of 120 seconds and was therefore skipped
Title #7/1 has length of 9 seconds which is less than minimum title length of 120 seconds and was therefore skipped
Title #7/2 has length of 11 seconds which is less than minimum title length of 120 seconds and was therefore skipped
Title #7/3 has length of 46 seconds which is less than minimum title length of 120 seconds and was therefore skipped
Title #7/4 has length of 33 seconds which is less than minimum title length of 120 seconds and was therefore skipped
Title #7/5 has length of 8 seconds which is less than minimum title length of 120 seconds and was therefore skipped
Title #7/6 has length of 11 seconds which is less than minimum title length of 120 seconds and was therefore skipped
Title #7/7 has length of 9 seconds which is less than minimum title length of 120 seconds and was therefore skipped
Title #7/8 has length of 11 seconds which is less than minimum title length of 120 seconds and was therefore skipped
Title #7/9 has length of 46 seconds which is less than minimum title length of 120 seconds and was therefore skipped
Title #7/10 has length of 33 seconds which is less than minimum title length of 120 seconds and was therefore skipped
Title #7/11 has length of 8 seconds which is less than minimum title length of 120 seconds and was therefore skipped
Title #7/12 has length of 16 seconds which is less than minimum title length of 120 seconds and was therefore skipped
Title #7/13 has length of 8 seconds which is less than minimum title length of 120 seconds and was therefore skipped
Title #7/14 has length of 8 seconds which is less than minimum title length of 120 seconds and was therefore skipped
Title #7/15 has length of 8 seconds which is less than minimum title length of 120 seconds and was therefore skipped
Title #7/16 has length of 8 seconds which is less than minimum title length of 120 seconds and was therefore skipped
Title #7/17 has length of 8 seconds which is less than minimum title length of 120 seconds and was therefore skipped
Title #7/18 has length of 8 seconds which is less than minimum title length of 120 seconds and was therefore skipped
Title #7/20 has length of 16 seconds which is less than minimum title length of 120 seconds and was therefore skipped
Cells 5-end were skipped due to cell commands (structure protection?)
Title #12 was added (4 cell(s), 0:30:52)
Cells 2-end were skipped due to cell commands (structure protection?)
Title #13 was added (1 cell(s), 0:12:15)
Cells 2-end were skipped due to cell commands (structure protection?)
Title #14 was added (1 cell(s), 0:07:16)
Cells 2-end were skipped due to cell commands (structure protection?)
Title #15 was added (1 cell(s), 0:05:16)
Cells 2-end were skipped due to cell commands (structure protection?)
Title #16 was added (1 cell(s), 0:06:05)
Cells 6-end were skipped due to cell commands (structure protection?)
Title #17 was added (5 cell(s), 0:12:05)
Title #19 has length of 67 seconds which is less than minimum title length of 120 seconds and was therefore skipped
Title #20 has length of 93 seconds which is less than minimum title length of 120 seconds and was therefore skipped
Title #21 has length of 93 seconds which is less than minimum title length of 120 seconds and was therefore skipped
Title #22 has length of 98 seconds which is less than minimum title length of 120 seconds and was therefore skipped
Title #23 has length of 97 seconds which is less than minimum title length of 120 seconds and was therefore skipped
Title #24 has length of 103 seconds which is less than minimum title length of 120 seconds and was therefore skipped
Title #25 has length of 108 seconds which is less than minimum title length of 120 seconds and was therefore skipped
Title #26 has length of 107 seconds which is less than minimum title length of 120 seconds and was therefore skipped
Operation successfully completed

[mike admin]

Please send IFO files per instructions at http://www.makemkv.com/faq/item/8/catid/6

[hdb3.net]

IFO file tgz sent, thanks