MIDI Issues With the Upgrade?

Hi everyone. I'm keen to pull the trigger on downloading the new Player (probably jumping to Level III to get all 8 slots). The only thing that's holding me back is that MIDI is essential for me, and I'm hearing rumblings here and on other forums that upgrading is cutting MIDI capability. I'm seeing theories that it's related to required firmware update. Has any one experience this? Just as importantly, has anyone solved it? Thanks.