Hello gma,
This is a known issue now and is caused because of the non-compatibility of Granular Control Center with the latest perl packages. So, chances are, the moment you updated the perl packages through Synaptic, Granular Control Center stopped working.
This can be resolved by downgrading to the previous perl version 5.8 from 5.10, until we come up with an updated Granular Control Center that is compatible with latest perl.