Using the default window size of CCleaner, the Options -> Settings -> Wipe Free Space drive list is not shown right (you can see in the first image). If you click on it, the drives in the list dissapear (you can see this in the second image).

1st:


2nd:

I'm sure this will be fixed soon, but in the meantime see this post:

http://forum.piriform.com/index.php?s=&...st&p=129627