Hi Manuel,

> As it seems perfectly reproductible on your system, the problem should be
> serious enouth to be noticed.

Yes, but it was not an issue when I used this computer with Gentoo Linux, so I
did not care.

I have "solved" it : after the first boot, I set ntpdate=YES & ntpd=YES in
/etc/rc.conf with a local computer for time-basis in /etc/ntp.conf.

Since these modifications, it works perfectly.

> > > Are you working on a NFS-mounted directory ?
> > No, I am working on a standalone computer, on local (hard-disk) filesystems.
> What filesystems ?

NetBSD "default" : ffs (/etc/fstab)

Thanks for all your help!

Sylvain.