it is not the portable CCleaner but a SFX made by bootzilla.
this was the program that I used.
I believe it is to do with the packaging of CCleaner into a SFX.
just tried it today 28 Nov 08.
the title bar goes grey, but then after about 2 secs it comes back.
0. make sure u have lots of files to clean, ie d'load some youtube files or browse net for 15 mins.
1. run CCleaner
2. Alt-R (Run Cleaner)
when the cleaner is in operation the title bar goes grey.