This is the only case that still confuses me for M2. My bld orientation is blue face in front, yellow face on top, and white on bottom. When I have the yellow/green piece in DF and the blue/white piece in UB or any other arrangement (b/w in DF and y/g in UB), I can't solve it. When all the other edges are solved, I don't know what to do with this, since it seems like I should use M2 to solve, even though it doesn't do anything.
Do I just do an M2 and then move on to corners, since then the pieces seem solved when ignoring centers.
Do I just do an M2 and then move on to corners, since then the pieces seem solved when ignoring centers.