Member Since: Jul 30, 2009
Mac Specs: Mac Mini Core 2 Duo
10-21-2009, 08:52 AM
you could try a fresh com.apple.SoftwareUpdate.plist
You'll find that in your Home folder(house icon) > Library > Preferences.
Drag it out onto your Desktop for safekeeping.
Fire up Mail.(see below - Mail not relevant here)
If the problem is gone, delete the file you moved, it is corrupt.
A new one was created in the Preferences folder, set to defaults.
If that fails, try using Mail (or here)
from a different User Account. If the problems go away, your other account is corrupt