CCleaner is not scrolling

Hello,

I've just installed the latest CCleaner on my Win10 64-bit system and in the registry cleaning section, I am not able to scroll through all of the items listed. Neither the bar on the right, nor scrolling with my mouse, nor clicking the arrow under the bar works. I can pull the bar down, but it just pops back up without it actually scrolling through anything. I have tried both the free and trial versions, same result. Any suggestions? Thanks.