About the ui\interface TGA files...?

[alpaca]

Ive had the same problem. The big thing is to avoid pasting into an empty space, rather exactly over something. Otherwise youll get what you have.

I agree also, interesting map. Whats it for?

That's probably not his problem because as you see none of the buttons of the files he edited are transparent.
Yes, I think the alpha channel isn't saved. The textures barely use it anymore I think (don't actually know how it's done, just had a look at some of the attset textures and most of them is white)

Try out the gimp and see if it works using that.