Medium Wings have their pitch inverted.

[Zyffer]

Medium wings now dive nose down when pressing S and climb when pressing W, even though the invert controls option is not selected.  This makes it basically impossible to pilot any craft which uses medium wings as the inverted pitch also seems to affect SAS.  The kerbal piloting the craft noses down constantly as they try to keep the plane level because their inputs are also reversed.

[salat92]

This seems to be a bug and it happens not only for medium sized wings.

 

What I think is going on:

the game has to decide somehow if a wing is a "front wing" or a "tail wing", because depending on the position of the wing, the direction of the control surfaces has to be inverted.

For example if you want to pitch "nose up" (pressing S), a tailwing's controlsurface has to be angled up while a control surface at the front of the aircraft has to be angled down.

I've put together a minimal aircraft to troubleshoot the issue and I was able to reproduce it by moving the wings or changing the "wing angle" in the proccedural wing configuration.

 

I'm not sure which information the game uses to determine whether a wing is at the front or the tail, but I guess the position of the wing's "center of lift" gets compared with the aircraft's "center point" (maybe the center of mass?!).

 

[TickleMyMary]

I second this bug... Highly frustrating and makes flying impossible.