I was flipping this lever connected to a comparator and a repeater and sometimes when i flipped it the pulse did not get through to power stuff (sorry im not the best explainer but you will see what i mean in the video)

Here's a link to a youtube video to see the bug http://www.youtube.com/watch?v=JWWUJu42z6c&feature=youtu.be

I think it has something to do with 1 tick pulses not sure.