Unable to select line on Windows start-up screen

Hi,

I hope that I will use the correct terms in English because my version is french (5.09.5243).

I am using CCleaner free for years now and it is a very useful tool.

Never had any problem with it.

However, each time I open the Windows start-up screen and try to select an "active" line among dozens of other line, buttons on the right won't activate !!

I have to try to select any line a couple of times (normal or greyed line) before buttons will activate.

Could not find any logic in that, although I am an IT professional.

I have had this problem for years now :-)

Thought somebody else would report it ...

Or am I the only one to have this problem ?

NB : I am Windows 10 now, 7 before.

Can you help ?

Thanks in advance.