I don't have my N900 at hand now, but iirc there's a group 'cron' or 'crontab' with the gid 102 in the image's /etc/group.
It doesn't cause any problems for me, but it might still be a bad idea to have it there. If removing this entry solves your problem, please let me know and I'll upload another image with the group removed.

As for your prompt, I believe the problem might be that Easy Debian by default bind-mounts Maemo's /home/user into the image. I consider this to be a bad idea since it messes Maemo's home up with stuff that doesn't belong there.
Therefore I've disabled this bind-mount long time ago and I honestly can't say what happens if it's still there.
I'll give it a try though and see if I can fix it.