Just installed v5.23.5808. System is Windows 7 64bit with IE11. Have set Ccleaner to keep certain cookies on the system. Have observed two separate phenomena.
1) After running the app IE will no longer "see" the cookies which are in the cookie folder. C:\Users\John\AppData\Roaming\Microsoft\Windows\Cookies. It is necessary to delete them all and re-import from saved file.
2) Sometimes, Ccleaner just deletes them all anyway regardless of the ones I want to keep.
I have reverted back to v5.22.5724 which performs as expected.