I have a little bit of accumulated dust in that same corner but that is after 9 years without ever cleaning it out.  Might want to check to make sure that the cowling over the cutter is completely screwed down and check to see if there is a crack or something or even make sure that the blower that expels the chips is working correctly.

--Nathan, TX. Hire the lazy man. He may not do as much work but that's because he will find a better way.