I'm on XFCE, and the Network Manager Applet hasn't been working since an update last week.
Running "nm-applet" in a terminal gives this:
nm-applet: error while loading shared libraries: libgcr-4.so.4: cannot open shared object file: No such file or directory
Checking the repositories indicates that Obextra has 4.0.0-1, while Extra already has it at 4.1.0-1.
At the same time, for some reason, I have 4.0.0-2 in my system.
Updating our OUR (pun intended) might rectify it?