As England...
It's a great thing Portugal can be called into the Hundred Years War again, but France also can call in their new allies, like Milan, Tuscany or whoever they want. It seems it became more impossible to win.
I can't ally anyone while I'm at war, but the AI can!! FIX THIS!!!!
You're the attacker in the Hundred Years' War. France is the defender. Nations in EUIV are generally more willing to join a defensive war than an aggressive one.
I fail to see the problem.
Despite a couple of significant bugs (like it being impossible to ally people when forming a formable nation like GBR, the Netherlands or Prussia because the AI thinks you're located on another planet distance-wise) and the performance issues, 1.8 is a generally great patch (one or two controversial design decisions aside). Definitely more stable and playable than some PDS patches in the past. So thanks for that!