The first one's probably easy - how does Defensive Weapon Training work for a fighter with two weapons? Does he only count the highest enhancement bonus?
The second is about the Special section of the Advanced Weapon Training feat. If I'm reading it correctly, a weapon master fighter can take AWT as many times as he wants, rather than just once per five levels?
Defensive Weapon Training gives you a shield bonus, and shield bonuses don't stack, so you get whichever is higher.
The weapon master can take AWT as a fighter bonus feat, which he gets at every even level; he can do that as much as he likes. He could also take it with his non-fighter odd-level feats, but on those the "once per five levels" restriction applies.