Alpha Blending Problem

If I load a model that has a materail with an diffuse alpha value less that 1, I enable blending and draw the model accordingly. Everything works great until I add a texture. The texture gets mapped to the mesh, and is transparent, but it''s blended with a previously used texture (bound for another model). I''m not using multi-texturing at all so I don''t know why these textures are being blended together. thanks.