Not a bug,
and also a very bad suggestion.
I suggest that you refrain from pinning to the taskbar,
and instead use an alternative such as a desktop short-cut or a hot-key,
and then you should know that an icon in the taskbar-notification tray is NOT an invitation to click what is already running.
I love the fact that I can simultaneously ANALYZE with Portable versions of CCleaner,
and compare on-screen the differences in their capabilities.
My old Portable version of CCleaner is fully known, fully tested, and fully trusted.
If I see identical junk detection between the old and the latest versions,
then there is ZERO reason to use the latest version and delete old faithful,
and every reason to delete the latest version and wait for the next release.
There is absolutely no reason to use the latest version of CCleaner with enhanced cleaning of IE10 running under Win8 when I only use Palemoon under Win7.
If there are differences between junk detection,
then I take responsibility for my own safety and evaluate the changes,
and decide if they are hazardous or worthwhile (what is one cookie or a 1 KB log file between friends).
Whilst having full respect for Piriform developers,
they cannot have the resources to test the full consequences of each CCleaner release upon every brand and release of
Motherboard
BIOS
Software (Utilities, Applications, etc.)
Alan