Hi one thing that have been bugging me is I don't get the looping to work on a part of a sequence! I turn on loop and then you should hit backslash or shift backslash.
If I only hit backslash it moves the inpoint instead of change the looping.
I think the problem is that have an swedish mac keyboard. Shift is on the same button on my keyboard but / on a swedish is on the same button as 7. Are you using the button left to the "right" shift button? or the one over return?