"Eating something hearty will protect you from the cold" messages in Wintry place stack down over your inventory if it becomes urgent that you eat...which means that you can't click on the items in your inventory in order to eat them!
Repro:
Get your energy low by petting/watering/harvesting/whatever
Go to Wintry place
Wait until warning messages stack down
Try to click on items in the bottom left hand corner of your inventory
Enjoy crushing hell grapes!
Schmoo ;)