IDirectPlay8Peer::GetSendQueueInfo problem

Hello, I''m a novice game developer and in the middle of creating my first networked game. I created a simple wrapper around the DirectPlay Peer interfaces (DirectX 8.1) and that seems to be working fine. So now I''m in the network optimization stages. I want to be able to peek at the message queue and get it''s size...and lucky for me, there''s a GetSendQueueInfo function. The problem is that it returns DPNERR_INVALIDPLAYER, even when passing in a DPNID that was returned by EnumPlayersAndGroups. Has anyone else run into this problem? If anyone has any suggestions for solving this problem or recommendations on an alternate solution, I''d appreciate your feedback. Thanks. -DerekMik