Comment 5 for bug 1375333

I have been having an issue with Blender 2.72 and Ubuntu Unity where navigation in Blender snaps to orthographic views and it ONLY happens with Ubuntu Unity. I have switched to Cinnamon as a temporary fix.

http://blenderartists.org/forum/showthread.php?353511-Ubuntu-Linux-Navigation-Issue&p

The issue involves using 3 Button Emulation (which is necessary for tablet use). When holding Alt to rotate the view, if the user hits the Shift or Ctrl keys (which is common because those keys are also used for navigation with 3 Button Emulation) the 3D view will snap to angled or straight on orthographic views making it impossible to properly navigate. I have disabled all actions associated with these keys in compiz settings and still get this issue. When booting the same Ubuntu but with Cinnamon instead of Unity, 3D view works as expected.