Hey guys, I'm finally all set up with my new computer, and sims runs like I never believed it would, it's awesome!
However, today when I decided to go back to making things I encountered this problem in Milkshape, and googling around doesn't seem to give me an answer. I've never has this problem before. 
Basically, there are specific vertices it just won't let me select and I don't know why. I tried exporting and reimporting, I even made a new file and created a box and it wouldn't select me vertices of that simple box. I'm out of ideas. If anyone has encountered and solved this please let me know ;_;

In the meanwhile, this is the house I'm making for Drew, her self-sim (as a plantsim) is going to live in my game and you'll see her in a couple updates. XD