Account rollback

Zynga has Recently fixed date 13 January and issue due to which some accounts have got rollback to previous state as of 24 hours.This has been notified at the zynga forum Jonieze.

They are investigating the case and stability issues.If you have lost some thing that will restored with you will compensated with the same as sorry from zynga for the inconvenience.
Link for customer care
http://zynga.custhelp.com/app/home

If your account has been affected you can wait for updates or file a ticket in Customer Support, please be patient if filing a ticket as we may have longer than normal ticket lines.

http://forums.zynga.com/showthread.php?t=875389