The Legend of Heroes: Trails in the Sky

[Kayss]

I encounter some problems playing "Legend Of Heroes: Trails in the sky" and I also have a general problem with PPSSPP itself.
First PPSSPP itself :
If I use any other rendering mode than "non-buffered" I have two small screen instead of a full screen one. Like this :
   

LoH Trails in the sky :

The game works fine, I don't have the black screen freeze if Estelle gets the last kill in battle. But I have another annoying problem. When the "active character" looks up (direction up-left up and up-right) the sprite is not display even if I switch to Joshua as leader. The second character sprite displays in all the directions. Screenshots:
   
   

As you can see I didn't move just turned the camera around and when the leader looks up it just disappears... It also happens during cut scenes. And in Rpg Games you spend 75% of the time looking up...

Any idea?

I use a Oneplus One running Cyanogenmod 4.4.4 rooted and the latest version of PPSSPP.