I don't like the Jack/Sharon story line either. According to the timeline of this show, he is waaaay too old for her. He was married to Nick's mother when Nick was just a little kid. In other words, he is well old enough to be Sharon's daddy. I find that repulsive.
I like Gloria better than I do Jack, so I'd like to see him busted and her to come out smelling like a rose. It appears that Kevin is going to put all the pieces together.
And Yes, what IS the problem with that jerk professor? Of course we know that eventually there will be a "love connection" between those two, but who wants to bet that the road will be rocky between now and then?
*and what the heck is the subject of that class and why is everyone so spastic to get in?*
AND why would Colleen want to stay in there when she has already figured out that the guy doesn't know what he's talking about?