For the past 10 hours or so players have been reporting white screens, server errors, lag and the general inability to load and play their farms.
Zynga has placed the following banner over farms to address those issues.
“Hey there Farmers! If you're experiencing any loading or freezing issues, thanks in advance for your patience as we're currently working on getting you back on your farm.”
Since the appearance of the banner, an additional issue has come to our attention. Many, many players are reporting receiving notices that their access to Farmville has been restricted upon trying to load their farms. As of now, that does not appear to be fully intentional on Zynga’s part as threads on the subject are being allowed to remain on the official forums. Those players may not have done anything to warrant the current short term bans. A super moderator on the official forums was requesting players that received the notice send it in to aid in their investigation of the issue
You can read that thread in it’s entirety here.
At this time, we here at the Dirt Farmer can only speculate that all of these issues are related. It seems likely that they are making changes to their system in preparation to handle something. We do not have definitive, confirmable information as to what at this time. If you are having issues, you are not alone. If you received the notice and have not done anything to violate TOS do not worry. They are working on it.