I have a model with a material/texture applied and i’m unable to paint on it in GLSL mode. Multitexture works fine, is it disabled in this mode?
You either have to be in Solid View Mode or in Textured view mode after you have added the painted image texture to the objects material, mapped to the objects UV coordinates
Not sure what you mean, what else would I be in if not solid or textured view? I have an AO baked image in the materials/texture and it is UV mapped.
Show screenshots showing exactly what is not working. Ensure to include all relevant wndows and settings. Attach blend file ensuring all textures are packed in the blend file.