Today I launched CCleaner (version 5.51.7644--the latest) and went to make some changes to cookies I save and found that CCleaner no longer shows the active cookies on my system. I'm running the latest Firefox (66.0.3 32-bit) as my browser. As far as I'm aware, the only change I've made to anything in my system is renaming the pinned Taskbar shortcut for Firefox (it was "Firefox (2)" and I renamed it to "Firefox"). I'm not sure what y'all may need to troubleshoot this problem, but just ask away.
I have upgraded CCleaner recently to the current (Latest as far as I'm aware) version. I simple in-place overwrite when I upgrade. I haven't uninstalled CCleaner once since I originally installed it on my system. That's a simple enough task, I can start there if someone thinks it will help.