it seems each time I try to modify it I end up with the default skin, I can't even use my old version because it did the same thing to that. This occured after the maintenence was done, I do hope there's a way to fix this
I have found that the UI Builder doesn't work with many windows, such as the Guild window. If you save certain window with the UI Builder it will cause the window to not display correctly or to revert back to the default, even if you don't many any changes what so ever.
Try using the UI Builder for visual purposes but make all of your changes via Notepad or Notepad++ (highly recommended). This will preserve the UTF aspect of the file.