pjjoe, i may have experienced something similar.. to make a long story short, i noticed that a little program that i use closed, which i have never seen happen before, and i have been using it for years.. after having read your post, i figured "deepscan" had something to do with it..
when i tried to re-open the program, a "deepscan" window popped up, saying "scanning", which took several seconds.. then the program was allowed to open and it has not been shut down again..
that is strange, that "deepscan" would just silently shut down a program that was running..