I had this problem as well seems their are rules
I can't remember who or where I got this but:
Oxygen will only load GIF or TGA bitmap files. These files must be of a 2x2 size format.
Legal sizes are 32 x 32, 64 x 64,128 x 128 etc up to 4048 x 4048.
Rectanglular shapes are permitted PROVIDED the sides are 32, 64, 128, 256, 512 etc up to 4048
Hope this helps
hmm - did you ever hear of pac/paa files?
Well, o2 can load gif/tga files, but will convert them into paa, once
you load them. Afterwards you can remove the tga/gif file from your
addons folder and use the new paa file.
btw - this way to convert gif/tga files seems to produce the best result
(better than textview or pantool).
Dragon - how did you setup your oxygen/buldozer?
Follow Planck's link and have a look if you did something wrong.
~S~ CD