md2 problems

My problems with 3d models is that I can never find a stable model format. I may find a 3d model loader that will work with the models and/or textures provided in the tutorial, but will crash on any others I try (this is the case with nehe, gametutorials, or even the OpenGL Game Programming book). Anyways to get to the specific problem, I am using the md2 loader provided by Kevin Hawkins and Dave Astle''s Open GL Game Programming book and it works for the two models they provide. The other models I do try load only when I use one of the two original pcx files that do work, but it looks silly to use a pcx texture on a model it was not intended for. Essentially if I use any other pcx file other than the original two for the texture, it crashes, and this is really frustrating me. Just wondering if anybody here knows what the problem may be. Thanks