Comment 127 for bug 937522

I have actually fixed this issue myself locally (along with many other remmina issues) but just going back to an older version...Specifically, the packages they included with 11.10 as everything was working perfectly then:

As a work around I uninstalled all of remmina and manually downloaded
the debs for remmina 0.9.3. I don't have any issues now. These are
the files I installed for 12.04LST x64.

libfreerdp0_0.8.2-2_amd64.deb
libfreerdp-plugins-standard_0.8.2-2_amd64.deb
remmina_0.9.3-2_amd64.deb
remmina-dev_0.9.3-2_all.deb
remmina-plugin-data_0.9.2-2_all.deb
remmina-plugin-rdp_0.9.2-2_amd64.deb

You can download these debs from here,
https://launchpad.net/ubuntu/oneiric/amd64

Last after they are downloaded you should lock these versions otherwise they will get upgraded the next time you upgrade your machine. Install synaptic if it isn't already installed. Then follow this procedure making sure to lock all the files you manually installed,
http://www.ubuntugeek.com/how-to-lock-package-versions-from-synaptic-package-manager.html