So just to update..
I've tried the following now:
1) System reset followed by install of V2.7.3 - The system boots up fine all profiles working
2) Upgraded to V2.7.4 - as above, all working fine
3) Just downloaded 3.0.0.10856 using chrome, its installed, performed screen checks, rig checks, pedal checks, effects etc.. it then looks like its going to load and I get a load of errors again
Not to worry, If I get a resolution via support I will let you know in case anyone else gets the same problem.
Mine is quite an early Kemper, I don't know if that makes a difference, I've also got the failing LED issue as well which to be honest doesn't bother me much unless its the cause of this issue
Cheers
Steve