Going into "Center" stance from Defensive, increases parry (by how much?), and then using Ashi to go from Center to Offensive gives "advantage". It doesn't seem to show up as a buff anywhere though. What does it do? How long does it last?

I'm wondering this as well. So far I haven't noticed anything.

It should show up as a buff? Certain techniques consume Advantage and give a pretty substantial bonus to some aspect of them.

Alright, thanks for the advice Majalis.

Everytime i'm playing the game, some minutes later this happens, it's random, sometimes is when i get out of some battle, some city, even in the load screen gives this error