Not to my Knowledge.
We started off with 5 teachers having sign in issues, Woke up one morning and it went down to 2.
I will check the quota when I'm back on site tomorrow, but I'm confident that its not that case.
The sign in issues have been troubleshooted to the actual machine as I've logged in with their own account on another machine.
Its really weird.. They have full control R/W privs... I dont want to give them any more access as.. well.. we all know what could happen.