Here's a short checklist when I encounter such a problem:
When loading the textures automatically by DBP:
1) Is the image in the correct directory? When the texture filenames are stored within the object file, the textures should be stored within the same folder. If your textures have any other format than
.bmp, chances are you'll have to texture it manually.
When loading manually in DBP:
2) Is the image filename written correctly?
3) Are you using the correct path? The current path is changed by commands such as
cd or
set dir.
4) When texturing the object, are you sure you're using the correct limb numbers and texture numbers?
If you can't figure it out using the above checklist, you can debug it by doing the following:
Try loading the images in DBP and paste them on the screen instead of texturing the limbs with them.
If they show up on the screen: You're loading them correctly. Meaning it's because of the model's appearance. Make sure you're using the correct image number. Also make sure you're using the correct limb number (try some different numbers starting from 0). If the object was just black, it could be a lighting issue, but looking at your screen shot that doesn't seem to be the case here.
If your screen is black or they don't show up: the image could not be loaded. Check the filenames again, check the directories again. Chances are high those are the problem.
If none of the above worked, you might have a case worthy of the bug report board.
[edit] This checklist assumes the problem lies within DBP. If the file itself is corrupt, then I guess it depends on the modeler.
Sven B