I've looked around on the forums at issues that other users were having with the update manager, but no one seemed to be having the same problem as I have. Basically, I am able to open update manager just fine, it gets its list of updates, but when I click install, or indeed any other button in the window it freezes before it even prompts me for my password.
Synaptic package manager seems to be having some problems as well. The only way that I can open it is through terminal, otherwise nothing happens when I click on it. I'm also unable to send crash reports, when I click on it, the cursor changes to busy for a few seconds, then nothing happens.