I didn't read every post on this page, but from what I have read I can see that only one person has come close to telling what the problem really is...
This comes from Zynga (you can find it just below the Farmville menu line, i.e. "Play, Gift, Neighbors, Invite, etc." :
"Howdy farmers! We are resolving reported LOADING issues and have TURNED OFF WITHER, so your crops and farms are safe. Fix coming soon!"
Apparently it's not woking. :(P