Hi Rick,
There is a .bat file for windows and a file for MAC as well called CleanPreferences at the below location.
C:\Program Files\Adobe\Adobe Captivate 6\utils - WIN
\Applications\Adobe Captivate 6\utils - MAC
But it will directly delete the preferences so we refrain from doing that, so that we can get them back if something goes wrong.
Thanks!
Shekhar