Did they fix the online problems?

Do you mean with multiplayer trophies & most wanted ghosts? Those are the only online issues I'm aware of other than the fact that when there's even a little lag, it REALLY throws the game off.

I haven't heard of any fix, but there is a way around Most Wanted Ghosts and trophies not showing up even when you've caught/earned them. After each Ranked match, just wait until the server updates before you enter or start a new match or the stats you've earned from the match you just played might not register. This can affect trophy requirements, cause you to have to catch an MW ghost twice, make the ghost appear much later than it should in the first place, or fail to update your rank and uniform.

The way you tell that your stats have updated is if you go under "Multiplayer Statistics," look at your cash total. Keep checking it until your cash increases to the new number. When it does, you're good to go. It sucks that you have to do this, but trust me, in the long run waiting for the server update will save you loads of time in your hunt for MW ghosts and trophies (especially Gozer's Most Wanted).