TouchPad (and Mouse) click disappears

Hi,

is it a local bug (on my computer) or some of us already get that trouble ?

It started with 10.8.5 (or at 10.8.5 time), disappears when I updated to Mavericks, then come back.

Today, it is worse: the external mouse suffer from the same trouble (not Bluetooth Mouse).

I do not checked today in another OS X account on my MacBook Pro (different user session), but it worked with 10.8.5 on that user, not in my regular user sessions…

BTW: I have a multimedia application running. I do not know (recall) if this was always the case previously / it was not the case when I checked with the other user session (on MY MacBook Pro).

IT IS NOT A HARDWARE FAILURE.

Am I the only one ?