Hi Simon,
Here is the new version with that toc bug hopefully squashed (at least it works on my machine now).
Here is the new download link and md5 sum for the Sigil.dmg for Mac OS X 10.9.X
http://www.datafilehost.com/d/c1b6f037
md5 Sigil.dmg
MD5 (Sigil.dmg) = 35e34df2f10ddcb88de125d8e9534cae
Please don't forget about **unchecking** the "Use download manager" and remember to use the Smaller Grey download button on the left hand side (and not the huge one on the right).
In case anyone else wants this bug fix, I have also attached the patch to fix the bug. I have now deleted the older copy from datafilehost as it is no longer needed.
Take care,
KevinH