When you are in default stand stance or crouch stance you can not change your stance higher or lower while you turn the mouse horizontally.
If you are in a low/high crouch or low/high stand- stance you can move just fine back to normal.
Vertical mouse movement works fine.
Place any unit in editor.
Move mouse in a constant horizontal movement and try to change stance from normal crouch or normal standing position.
I am unable to reproduce this report. The player character will assume any position whilst turning with the horizontal mouse.
Tested on Version: 0.61.106023
Note to Bullet Purveyor - Are you running any mods? This is the second of your reports I've been unable to reproduce.
Mass closing ancient tickets with no activity for > 12 months; assume fixed or too trivial.
If this issue is still relevant in current dev build, please re-post.