I wonder if rasberries have natural pectin in them. If so, I could see that doing some strange things, but I'm not sure what. I know that they would add a bit of tartness, but as you didn't heavily hop the brew, it might still be fairly well ballanced. Be interested to hear how it turns out.
O, guid ale comes, and guid ale goes,
Guid ale gars me sell my hose,
Sell my hose, and pawn my shoon -
Guid ale keeps my heart aboon! -- Robert Burns