Theoretically speaking, Haste shouldn't work in conjuction with Time Stop since Time Stop is basically a Haste spell on crank.
Of course, Time Stop is a wierd spell that has a lot of quirks due to balance issues, among other things, so we can just throw common sense out the window.
In my opinion, Time Stop is already extremely powerful. Throwing Haste into the mix goes beyond what is acceptable, in terms of balance.
I'm going to write the Sage this evening in regard to this issue. I'll post his reply if/when it comes.