Can't mod kill icons

Ok, I've modded kill icons before (used variations on the awesome bar, ect) so I'm familiar with replacing the files. Recently I decided to make my own, so I used GIMP to open the existing TGAs and then edited (read as "paste over") the stock images, and then saved. TGA view shows the change was successful, but in Crossfire, the stock images still show up.

As a sanity check, I downloaded one of the premade killsets on this set and pasted them into Mark. Crossfire loves those just fine :/

So I have no idea what to do now. Is gimp messing them up? Should I use another program instead? One last note: I have Win 7 x64, and security permissions are not the issue. Long ago I have myself full access to the rex folder, and, for example, don't need to respond to a UAC prompt when renaming files in Mark.

GIMP should be no problem, many people prefer better programs like PhotoShop, but I used GIMP as well. Make sure that u replace the right files.
Gamefolder-->Rez-->UI-->Mark, and then the normal kill marks are Badge_multi1(2,3,4,5,6), The headshots are: badge_headshot, badge_headshot_gold, badge_headwallshot and badge_headwallshotgold, and the grenade mark is badge_grenade.

~Hope I helped ~