I have 41 cotton fields that did not harvest, the game date is now 1/25.
I should have had 492 cotton on 12/24 and got nothing, the fields are not reset, the dot was green showing they were growing.
So now I have 11 months coming with no production and a severe loss in income. 
Please write your firmname and 7 or your playerid in the post.
We can not help without the information.
The last 2 cycles harvested, must have been a 1 time bug, although an expensive one, I figure I lost 9M because of it 
I have search in the backups.
You have do anything in the month before the harvest (i think, you have change the product.).
Therefore, the harvest failed.
