I regularly look at 'cookies' in the 'Options' list. Until V 5 appeared, running CCleaner got rid of all the cookies in the left-hand - non-saved - cookie column. Now, there are usually residual cookies. Just now, I had a list of 25 cookies, including several I recognize as tracking cookie. Only 8 of those were removed, leaving 17 behind. Even doing the right click on cookie, selecting 'Delete now' on the drop-down doesn't do the trick. BTW, I"m running Windows XP PRO, SP 3.
It took a very long time to download and install V. 5.
Very disappointing after years of proper functiioning.