I just recently upgraded to the FRG01 found here:
Download: New DROID Froyo Build FRG01 - Droid Life: A Droid Community Blog
I then noticed that all of my Contact's pictures from Facebook had vanished. Further investigation showed that Facebook had disappeared from my Accounts & sync settings.
I logged out of Facebook and logged back in, the account appears under Manage accounts. I reboot... and it disappears again.
It won't stick. And if it doesn't stick, my contacts have no pictures, and I'm one of those crazy people that LIKES the Facebook contact pictures.
Has anyone else encountered this?