Recently opened files/folders not cleaned
For the past few days, CCleaner has stopped removing the recently opened files from taskbar icons. I've already checked the Cleaner program to clean Recent Documents, Temporary Files and the like, and the files list are still there. I think it's a bug.
Windows keeps multiple different 'Recently used' lists for different places and different things.
In this case the 'recently used' list is the one for apps that are pinned to the Taskbar - so what you need to be clearing is 'Taskbar Jump Lists'.