I figure I would chime in since I am the one who found this issue but didnt have a profile here to post about it.

Quote Originally Posted by Iscah View Post
The railings look the same to me.
The "chair-rail" on the south wall is twice the thickness of the same rail on the north wall.

Quote Originally Posted by Iscah View Post
They're going to be the same model copy-pasted around the room.
Not entirely true. If you have done any type of mapping for video games, you would know that the chair railing isnt actually attached to the wall itself. it is just floating at a fixed point. this is to reduce the number of polygons in the house. same for the pillars. they arent actually attached to the walls. chances are, the walls are slightly off. the distance between the walls are correct, but they are offset by a small amount.

Quote Originally Posted by Iscah View Post
It looks like a camera angle issue rather than one that's actually there.
It is most definately not a camera issue. It is very noticable on walls with windows. On some walls, the trim sticks out farther than the windows, on other walls, the windows stick out farther.

Quote Originally Posted by Iscah View Post
It's also worth noticing that there are two alternating types of pillars along the walls
The issues displayed here have absolutely nothing to do with said pillars.

Quote Originally Posted by Iscah View Post
what does that have to do with whether the towel rail will align with the vertical panelling?
Because the walls are offset. Thus making the snap-grid not line up properly with the floor and wall textures. That is why the east/west walls dont line up with the snap-grid.

Quote Originally Posted by Iscah View Post
Also I don't understand what your screenshot of the floor is supposed to show.
Same thing applies to the floor. It is offset slightly, the same as the walls. Easiest way to see this is by using a floor with a tiled texture. The snap-grid is supposed to line up with certain lines on the floor. But it does not.

Quote Originally Posted by Iscah View Post
it's designed to line your furniture up with your other furniture
I am not sure where you are pulling this from but you are completely incorrect. The snap-grid doesnt help you line things up with other furniture. It helps you line things up on...... THE GRID.

And as a side-effect of this issue, you can get things closer to northern walls than you can southern walls.

also also, ceiling lights are not center to the joists. again, offset slightly.