I just put an OWC Mercury 3G SSD in my Mac Pro 3,1 to use in conjunction with a rotational HD. OS X on the SSD and Users folder on the rotational drive. I get theses error messages, one on app launch and the other when trying to authorize iTunes on this Mac. I've linked the Users folder to the SSD in Sys Prefs. I've reset, repaired, restarted... the usual steps. Everything seems to be working fine except for this authorizing issue. I also de-authorized my iTunes account and tried again. Eventually I planned on moving the Users folder to the SSD, minus media folders and link them via Terminal to maximize performance, but wanted to try this basic set-up using an SSD first. It sounds like it's something silly, but I don't know enough to figure it out, so anyone that has some ideas would be helpful.