These Ruling(s) have not been confirmed as applicable to the TCG.[Notes 1]
If 2 Flip Effect Monsters are flipped at the same time with a card's effect, like Desert Sunlight, their effects will form a new Chain after the current one has resolved. If the same player controls both effects then he will choose the order in which the effects will be placed on the Chain.
Previously Official Rulings
These TCG rulings were issued by Upper Deck Entertainment and have since been deemed unofficial by Konami. They were previously considered official and can still be correct, as long as they follow the official gameplay rules, or unless Konami has issued a ruling that says otherwise. References: 
↑Konami Judge Program Rulings are considered unverified, as their source(s) are not publicly viewable. They are not confirmed as applicable to the TCG until they have been officially published by Konami.