Start by deleting the preferences so they get rebuilt with new defaults and reinstall AE with sufficient user privileges. Also check the Adobe folders in your user home directory and Library for whether they are fully accessible. Apparently this is some weird problem where folders suddenly disappear or become inaccessible due to some OS X security stuff.
Is this happening with any footage that you try to track or a particular one? Could you share some details (frame rate, frame size, format/codec) of the footage? Also, could you try tracking on a new project?
I have already tried many different projects, mostly they were encoded in H.264 (If there is another codec in which it will work, this will work as an option) And it lasts with a lot of projects of different frame rates, etc.