I remember have got this problem with older version ( 1.1.07 and 08 ) .
I have do again some tutorial, and it seems fixed, i can't exclude one bug or another remain anyway. But should be ok.
Anyway, you don't necessary need to download the complete version if you want use the Steam one.
Download the patch files for 1.09
In Steam, disable the update for DCS A10, close Steam, launch the patch, and you will get it updated to 1.09.