Synaptic and dselect behaving oddly

[Nathan Sprangers]

I'm having a problem with Synaptic and dselect.  Synaptic no longer 
displays any packages.  In the status bar at the bottom it says "13151 
packages listed" but there aren't actually any packages listed.  Similar 
behavior in dselect: shows only packages that have been installed or 
removed, none that haven't been installed yet.  I think this started 
after I installed a couple source packages, but I wouldn't have expected 
that to cause this!

Oh, something else that's interesting, aptitude works fine - shows 
everything, so I don't know what's up...

~Nathan