Posted on 16 March 2012.
Update : Farmville has removed the message from above the game so we assume loading issues are fixed. We will update if anything changes.
Farmville is pretty much broken right now. Most farmers are unable to load their farms. It appears Zynga is aware of the issue as they have posted a message above your farm.
Attention Farmers! We are receiving reports that some users are unable to load their farms. We are currently investigating the issue. In the meantime, crop wither has been temporarily disabled