The program isn't performing the Default mail check at the required interval. I only noticed just before when I looked at the screen and it said 'Default mail last checked 1 hr and 4 mins ago'

However I also noticed at the bottom left of the screen there is a blue bar and the message 'Evaluating Message 17 of 17' that still seems to be scanning something.
What's happening?
(This time I'm NOT checking the 'Notify me' box)