I have been revamping a lot of ship mat files for a new mod to be released on the server I use but I am having a few problems with the new skins not appearing in game and I have tried many ways but all seem to end in failure.

Certain ships I can seem to change without any problems but others just seem to stay as they were even when I have altered the files and saved the mat.I use a UTF editor to export the files I want to change(I usually check on milkshape first to see which files are where on the ship) and then save them dds format.I create a folder to put these files in and rename them the same as they are originally called ie liberty1_256 but save them as .dds.I then use photoshop to open them and when the file opens I crop it back so I just have the 256 image left.Then I go to work altering the skin.Once I have done what is needed to the skin I save it and when the Nvidia window comes up I set mipsmap to 6 for 256 and 5 for 128.I then import the file back into the mat using the UTF editor I then save the mat and put it back into the mod I am Using.This seems to work on certain ships but not on others.Can somebody tell me what I am doing wrong or perhaps certain ships cannot be modded,I have spent quite a few hours trying to solve what is going wrong but I need some help as I cannot seem to find the answers myself