[Haskell-cafe] bug in Data.ByteString.Lazy or in me?

On a 64-bit Windows 8 server EC2 instance, with Haskell Platform freshly installed from the package installer, GHCI> :m + Data.ByteString.Lazy GHCI> Data.ByteString.Lazy.hGetContents stdin gives me an immediate error "hGetBufSome: resource exhausted (Not enough space)", while GHCI> :m + Data.ByteString GHCI> Data.ByteString.hGetContents stdin waits for user input, as expected. On 32-bit Windows, both work as expected. Can anyone explain this? Is this a bug in bytestring? John