Firmware 3.0 is the first version I've ever had a problem with. I used every version (including betas) for the past two years without a problem.
For me, version 3.0 just doesn't work, it won't work with Rig Manager 1.3.1, it doesn't show the rigs on my lunchbox, can't add rigs, can't delete rigs. You get the picture.
I went back to the previous version of Rig Manager (ver 1.2.3) and FW 2.74 and everything's fine. I would really like the new features, so I'll just wait till they get it sorted.
Just proves the Kemper team is human!! (I was beginning to wonder)