I'm sorry but TBNL is kind of unsupported for SBCL. I don't use it and nobody else has sent patches yet to fix the known problems.
Cheers, Edi.
[*] To make this clear: The problem is TBNL, not SBCL.
Well CVS SBCL supports bivalent streams and the only thing i had to do was - add tbnl-bivalent-streams to features ... now examples work just fine. Ignas Mikalajunas