On your Quest Watch there is a green button (tooltip says "Show Quests On Map")
Make sure it is clicked (It will be a brighter green for on).
Hopefully this helps.
@talljrock
Just wanted to let you know that the use of Wowmatrix is generally not welcomed around here. The use of this program hurts sites like Curse and here. It basically a leech.
For a good read as to why .. please look at this
thread.