I launch CSC and it start to scan my computer.
After a while , when the scan is finished , on the "home" screen , the button "Clean my computer" still grey and i can't do anythings. just Close :-)
And under my computer names , i see "Loading....."
I'm using windows 7 professional 64 Bits with a disk encrypted by Bitlocker
Can you tell us what version you are using? This bug should be fixed in build 53.