WHOA!
I am also surprised to see this hasn't been mentioned before.........a ver 10 oddity?
I have been experiencing something like this; It seems random. I change views from perspective to orthogonal and the proportional geometry, x, y, & z are off. Usually my x axis is stretched, but occasionally the model will be skewed, like a mistake in photoshop. I haven't had time to investigate, so I just press on, go to the preset views, select one, usually from top left, it's all good again, and then rotate back to the view angle I want from there............carry on.
When I get buried with work I am only thinking of forward motion only, if the program acts up or strange, I tend to only be interested in a "quick fix". I'll try and pay more attention to this and see if there's a pattern........
jeff white
w3d design
AC 23 Solo US / current build & library
Windoze 10 Pro 64
HP ZBook 17 G4
Intel Zeon 3.0
Twin 2GB SSD
32 GB memory
http://w3d-design.com