I run all of my solo battles on MVP. I just found out that the 'normal' solo battles are tracking nicely, but the difficulty-dependent ones are still at 0. Anyone else having that issue? I only do the solo battles because of the high bonuses at 20/25 wins on MVP or higher.
Edit: dug a little deeper on the EA website and found this topic. If you also encounter this issue, please hit the "Me Too" on the bottom left of that OP in the link.