Just tested this in my game and I believe I fixed it. I simply re-saved the masks to dxt1 alpha bit 1 via S3PE and photoshop.

The file is included in this post (hope mods don't mind as I know we were getting somewhat desperate)

There is one problem with these and that is the diagonal windows are not seamless. I do not know why this is as the dimensions of the textures seems to be the same as the original hazui provided. That said, I do not remember if the original diagonal walls were seamless when built in walls and after further investigation I believe it has to do with the way default windows are textured in game. Hopefully hazui will come back and try making the windows jutt out of the wall. I wonder if that will fix that texture issue.