Hi - I've discovered that the finalizer in the code below is always called with a NULL pointer even though the pointer returned by the allocation routine is always not NULL. Is this a known bug, and if so, are there any workarounds? I'm using ghc version 6.4: data RawFont newtype Font = Font (ForeignPtr RawFont) foreign import ccall duma_createFont :: CString -> Int -> Bool -> Bool -> Bool -> IO (Ptr RawFont) foreign import ccall duma_releaseFont :: FunPtr (Ptr RawFont -> IO ()) createFont :: String -> Int -> Bool -> Bool -> Bool -> IO Font createFont name pointSize bold italic underline = block $ do f <- (withCString name $ \cname -> duma_createFont cname pointSize bold italic underline) >>= newForeignPtr duma_releaseFont -- Gets a NULL pointer!!! return $ Font f Thanks, Brian.