Canonscan 5600F scans too bright in 600dpi

Hi !

I use a 5600F for a long time, just fine. I just received a few weeks ago a new computer that runs with W10.

I use the latest version for the [one and only] 5600F driver (sd64-win-5600f-14_0_7a-ea24.exe).

Strangely, the result of scanning is really too bright when I scan in 600dpi; while everything is normal in 300dpi.

I didn't change (and, in fact, I can't change) the colorimetric profiles.

For now I don't know where I could look for. Someone have an idea ?

Thanks for your help,

Fanny