My CCleaner is v1.27.260 - Basic, and OS is WinXP Professional SP2.
After Issues search is done and if i get "No Issues were found" and then make new Issues Search and if i now find "Problems", then Checkboxs are gone and i can't unselect problems. Also Mouse context menu does not work.
Closing and Re-starting program fixes it, but it happens always again if i some point make "No Issues were found" search.