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I keep receiving a navigation error when encountering the first title on the disc. I have tried using manual mode as well but I receive the same error. Couldn't attach the log text file so I posted it below. Any help would be appreciated and if it helps, the DVD is Slipknot Disasterpieces.

Debug log started at Sat Sep 02 20:57:09 2017 , written by MakeMKV v1.10.6 win(x64-release)
Using 524544KB for read cache.
001005:0000 MakeMKV v1.10.6 win(x64-release) started
001004:0000 Debug logging enabled, log will be saved as C:\Users\Jake/MakeMKV_log.txt
003007:0000 Using direct disc access mode
003024:1000 Complex multiplex encountered - 29 cells and 11124 VOBUs have to be scanned. This may take some time, please be patient - it can't be avoided.
001003:0020 DEBUG: Code 100864144 at Eq9Ux;p}EI0#@=R{:121269731
001003:0020 DEBUG: Code 100864144 at Eq9Ux;p}EI0#@=R{:121269731
001003:0020 DEBUG: Code 100864144 at Eq9Ux;p}EI0#@=R{:121269731
001003:0020 DEBUG: Code 811590 at D_;iFu)fr40)qDy_:121263383
001003:0020 DEBUG: Code 0 at M<.e}'IqclI-pG#l:Y:121273457
001003:0020 DEBUG: Code 0 at M<.e}'IqclI-pG#l:Y:29406879
003015:0000 Title #1 (1:38:50) was skipped due to navigation error
Title skip vts=1 pgcn=1 hash=6F7FCC3C474925B9
003019:0000 Cells 2-end were skipped due to cell commands (structure protection?)
003028:0000 Title #2 was added (1 cell(s), 0:00:30)
Title skip vts=1 pgcn=2 hash=4DD1822EC26AFD16
005011:0000 Operation successfully completed
Application exited at Sat Sep 02 21:03:34 2017

I'd recommend following the procedures outlined in the FAQ in my signature, and send the files to support@makemkv.com for analysis. But I'd first recommend cleaning the disk, because most of the time I have encountered this error, it has been an issue with the disk itself being unreadable in places.

The exception being disks from Lionsgate, which have such errors deliberately places on the disk, to make them harder to rip.