sorry, i better write in english. even though i understand french quite well i have not practised writing for a long time ; )
for the dock-thing:
i have the same problem!
i bought a powerbook with tiger recently. i think i didn´t have the problem in the beginning . .. but now - no matter what type of document i choose - i can no longer drag+drop them onto the icons in my dock. they won´t highlight ( darken) . ..
if i press apple+alt the icons will darken but the document won´t open anyway.
i have tried all forums in germany but found no solution . ..
maybe here someone will have the answer?
one strange thing is: if i change the profile from my main ( admin) profile to the guest-profile then it works! is it the same with you, jean_claude_dus?