Comment 20 for bug 1274613

The problem is in "blueman-applet".

For more details, see:
https://github.com/blueman-project/blueman/issues/64

I solved the problem, installing the new version of this package (for Trusty), in:
ppa:cschramm/blueman

(https://launchpad.net/~cschramm/+archive/ubuntu/blueman)