Maybe take a look at the discussion in this message stream about fixing the audiobook sequence for Clip Sport & Jam players. Maybe these ideas will work for your Clip+ ??
http://forums.sandisk.com/t5/SanDisk-Clip-Sport/Audiobooks-do-not-show-up-properly/m-p/355309#M3090
I think the problems you are having are related to using 3-digit prefixes in filenames (and maybe 3-digit track numbers in the ID3 tags?).
I find that 2-digit prefixes in filenames and track numbers work well fo my Clip Sport & Jam. (Try 00-99, and not single digits).
