The Mirror activation within the Options is as far as I know only to define the default behaviour.
However, I flushed my Saved Games Folder just to get sure its not due to something in their.
Made a REPAIR, if someone may think I haven't already done!
Test every single Module which I own and it seems to affect only the A-10C.
Appendet are Screens of my Gfx options and a screen of what it looks like....
Regards...