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Not able to backup up disc 1. However this is a two disc set and the second disc backed up fine. Using 1.9.8

DEBUG: Code 0 at ofNW*H[v`p8R$wcb$f{RI:29398967
001002:0020 LIBMKV_TRACE: Exception: Error in p->FetchFrames(2,true)
005003:0000 Failed to save title 0 to file C:/Video/MKV/Crossroads_Guitar_Festival_2010_Disc_1/Crossroads_Guitar_Festival_2010_Disc_1_t00.mkv
005004:0080 0 titles saved, 1 failed
005037:0204 Copy complete. 0 titles saved, 1 failed.
Application exited at Fri Jan 01 23:46:15 2016

Try cleaning the disk and re-ripping. Make sure that debug logging is turned on (see FAQ link in my signature), and if it still fails, follow the information in the FAQ for submitting the log and information files via email to svq@makemkv.com so that Mike can take a look at it.