I'm using Toast 9.0.5 on Mac OS 10.5.7 and I'm seeing something very strange

When I start Toast & use the selector at the bottom of the window to select 'CD' in the space remaining indicator it shows space remaining as being 210.6MB even before I put a blank CD in the tray; it also shows the consumed space to be 0 Bytes on 1 disc. I haven't even dragged anything into the window at this point, so I would expect the figure to be around 650MB.
Does anyone have any idea what is happening to cause this?
OK, I trashed the (2) Toast Preference files in <user><Library><Preferences> & that fixed the problem.