Trouble with the graphics

[El Maharun Llama]

I have encountered an interesting problem when creating a new ruleset. You see, I've made a copy of the d20 ruleset and renamed it. I also renamed the files with "d20" reading on them, both the XML files themselves and inside the base.xml file. What the problem is that when I edited the classes.xml file, all of the sheet graphics seemed to disappear when I launched the game. Sure, the edited text works all fine, but the character sheets have gone missing along with the monster list and d20 reference sheet, giving me only the text and the buttons.
I have scripted very little in my life, so I've no idea how to possibly correct this problem. Any help would be greatly appreciated.

[Oberoten]

Check BASE.XML so it doesn't point to the d20named files.