dont think any 1 could be an expert on watery droppings, but i would agree with oldyellow, change in brand of corn most probable, and you say you have upped there training, could be a bit of stress? as all birds act differently, mine often have watery droppings on return from a race, but soon return to normal, if there flying and eating o.k, then no worriers, unless they are drinking more than normal?