Mac OSX Snow Leopard 32bit
Pic 1: on the top setup the line coming from the not-clock comparator does not turn off. on the bottom it flashes.
Pic 2: Subtracting comparator loops turn off twice as slow as non-subtracting comparator loops.
Pic 1: https://www.dropbox.com/s/rq8cx4soxgf7dxc/2013-02-12_22.28.27.png
Pic 2: https://www.dropbox.com/s/w5e9i6iq1a6yk2g/2013-02-12_22.31.37.png