I'm using cocos2d v0.99.5-beta2 and I have a strange problem only on iPhone 1st gen and iPhone 3g.
When I change iPhone's orientation all my CCSprite are deformed and duplicated. I already have tested many methods to rotate my scene but I always have the same result.
But I haven't this problem on simulator, iPhone 4 and iPad.
I wonder if it's not a problem linked to the hardware. It looks like as the graphic hardware doesn't support orientation changes. But it's only suppositions.
I hope someone can help me.