I'd give it time with the change for daycare before jumping to conclusions about the R affecting him there. I'm sure you have, but explain to the folks there what's going on so that they can keep you notified.
I know that our girls loved the daycare they were at. However, our oldest, who is tiny, but has a huge voice, cried EVERY day for about a year when we dropped her off. Wailing, gnashing of teeth. After we would leave, she'd be fine. Kids are funny, don't blame yourself or the W for this before you're sure that's the cause of his behavior -- someone may have just hit him with a plastic dinosaur or something
BD
My latest
Me: 36 W: 35 2 D: 9 and 5 T: 16 years M: 12 10/4/06: Bomb 10/5/06: Ended A 4/22/07: ILYBNILWY