Hello luispa,
yes, i can confirm the bug.
Cinnamon 1.7 from debian unstable repo is utterly broken and its maintainer has abandoned his tries.
But he got helpers now, and they are preparing cinnamon 2.2 which is in debian experimental.
$ LANG=C apt-cache policy cinnamon
cinnamon:
Installed: (none)
Candidate: 1.7.4-2.2+b2
Version table:
2.2.9-1 0
1 http://http.debian.net/debian/ experimental/main amd64 Packages
1.7.4-2.2+b2 0
500 http://http.debian.net/debian/ unstable/main amd64 Packages
I didn't install it so far.
greetings
musca