Well, finally, it was probably a local configuration/set-up problem.
For whatever reason, the problem went away, probably after I reset my
home user folder. Sorry for this invalid report.
** Changed in: unity (Ubuntu)
Status: New = Invalid
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Screenshot 2
** Attachment added: Screenshot 2
https://bugs.launchpad.net/ubuntu/+source/unity/+bug/1240736/+attachment/3879761/+files/Capture%20du%202013-10-16%2018%3A26%3A06.png
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Screenshot 3
** Attachment added: Screenshot 3
https://bugs.launchpad.net/ubuntu/+source/unity/+bug/1240736/+attachment/3879762/+files/Capture%20du%202013-10-16%2018%3A26%3A20.png
** Description changed:
On a fresh Ubuntu 13.10 install, with a fresh Dropbox installation, I
get a
