So i have m8 2.01 authourised to my laptop, with two users. I use a clean user when i do gigs & general for extended use of m8. I have found this to work really well as my main user account has loads of extra bits that could cause some chaos somewhere.
The problem i had was when a started m8 in new user it wanted to re-authourise. Not knowing that it may use up another of my installs...i did not go ahead.
I simply moved com.garagecube.modul8.plist from User A to User B preferneces folder. User A had done the authourisation. All worked on user B from then on.
This of course only works on given machine as hardware address is linked with serial number to create an authourisation for m8 to run. ( or something like that !!!!)
Anyway enough of the ranting hope it helps