Updated iOS software to 4.2.1 on my iPhone 4 and an iPhone 3G last night. Everything is working fine on both devices. I can locate them on the website or via the app on each device. I have no problem sending them messages or remotely locking either device. However, on both devices, I keep randomly getting error messages that say "Cannot Access Account". The message also contains my Apple ID and 2 button options. 1 is the "OK" button and the other is a "Settings" button. Hitting "OK" seems to do nothing but close the error message box. Find My iPhone continues to work fine if I just hit "OK." Hitting the "Settings" button takes you to the settings screen for Find My iPhone. Again everything looks good on that screen and if I just close it out without making any changes, Find My iPhone still works fine. This isn't really that big of an issue except for the annoyance of getting the meaningless error messages. There doesn't seem to be any pattern to it at this point. The messages sometimes come within a few minutes of each other and sometimes they are a couple hours apart. Anyone else experiencing this or have any ideas about fixing this?