Hey tfrel,
You normally get that error if your account hasn't been logged into Qube!, this is because Qube! uses your windows password to run your jobs, if your administrator has setup the farm to use the genuine windows user accounts.
To login, just goto Start->Programs->PipelineFX->Qube!->Windows Login
Type in your "windows" password. The supervisor will double check it to make sure the password is ok.
Or alternately, you can:
Start->Run cmd
cd C:\Program Files\pfx\qube\bin
qblogin
Type in your windows password there.
Thanks,
A