Thanks. I overlooked this when transitionning to LibBabble-Spell-3.0.
You can't choose the size of the aura frame when you choose Top or Bottom side. You're supposed to be able to select the side even when not split, and I'm pretty sure I had it working... I'll look into it.
Clean installation of Pitbull/PB_AA didnt gave that option. Infact i couldnt do it since the first release. The only way i can place them without split to bottom or top is to load original Aura module and choose side there,then relog with AltAura. I think it has something to do with taking side from the original Aura settings.
Update: Settings of side are located in global section of each frame's layout,not in the module section of AltAura. auraSide,debuffSide,buffSide. Maybe it has something to do with this.