try turning off index.dat cleaning and see if that works. Just guessing. Also do you have Microsoft's protected browsing turned on? Or are browsing in ie private mode.
Thank you Nergal. But not removing index.dat didn't make any difference. I always run in normal (not private) mode.
I've tried using the IE link in program files and running the ccleaner64 link
I've tried using the IE link in program (x86) folder and just the CCleaner link
But it does the same to both
It only ever happens once I've used CCleaner and reboot. But it doesn't happen everytime, if I'm really quick at bootup and open IE, it sometimes keeps the cookies. It must be something happening upon bootup at the desktop stage. But if I don't run CCleaner, the cookies aren't touched.
I don't run defender. My antivirus is NOD32. I'm wondering if that could be doing something. I'll try uninstalling AV and see if it still happens (will have to be tomorrow now).
The same cookies/sites in Firefox are OK, so it is specific to IE.
Just to chime in that I am too having this issue, with Windows 8 Pro 64-bit/IE10. Never been a problem for all the years I have used CCleaner and the various versions of Windows /IE. And of course I do not have the 'delete Index.dat' files option selected.
I have noticed that there seems to be a bit of a random element to this, it doesn't lose the cookies after every single reboot, just most reboots. Might be something to do with using CCleaner more than once in between reboots, I don't know.
Very annoying though, so good luck tracking down and fixing this issue!