As of CCleaner 2.00.500, I seem to be having an issue after updating to this version where if I attempt to actually "Fix" one or all registry issues, the buttons do nothing. About 5 minutes before updating from version 2.00.4xx, I ran the same registry scan and all issues were fixed successfully, but after updating the buttons are clickable, but have no action present when pressed. The cancel button works fine, and if you choose to "Fix" all selected items, the dialog still pops up asking you if you are sure you want to do this, but after that nothing happens.
I'm going to take a guess and say that CCleaner's new skin may have bugged the buttons for this section of the code, or that the programmer(s) re-coded the button section and forgot to fix them, but either way it seems to be happening every time. If anyone can test this and report back in case it's a single- or multiple-person issue, that would be greatly appreciated.
Specs, (if needed for debugging hardware-related issues):
Microsoft Windows XP Home Edition With SP2 (Version 2002 Dell OEM) with latest updates
768MB RAM @ 333MHz
ATI/VisionTek Radeon X1300 PCI
Samsung HD300LD 300GB E-IDE Hard disk drive
Intel Pentium 4 Prescott @ 2.8GHz (No HT Technology/Single Core)
I have not yet tested this on my Microsoft Windows 95, 98, or Vista Ultimate installs, so I can't guarantee either way if this is XP-Only or Windows-related in general.