Basically this picture should explain what im seeing:

It has some odd flickering when you move your view as if there is multiple textures trying to cover each other(possibly the textures are inverted on each other maybe the same texture displaying in both directions). and that would make some sense if it was since there are no holes to see through like before. I updated from 2.1.2 to 3.2.6, so maybe they aren't suppose to look like that anymore? but I do know there is flickering, it also has some flickering on the glass doors aswell, but only on the sides. And with glass if there was 2 textures covering each other, the middle would still be see through, and it is. there is just a couple pixels around the edges that flicker.

I haven't tested this with 1.7, so i don't know if the problem exists there, its not really a big deal, it just catches your eyes when there are imperfections in something and you notice them. if it didn't flicker i would not have noticed the screen door not being see through.

Edit:
I just tested in 1.7 and it looks properly and doesn't flicker:

Minor render mix-up, will fix asap.

The latest build for 1.6.4 has been updated to fix this. Just download it again.

Wow you were fast. Thank you :)