Hello there and thanks for the greatest Atari ST emulator!
Found a bug that occurs only in Steam SSE 3.9.2 and 3.9.1 as well, with The Great Giana Sisters - STE 2014 conversion by ZAMUEL_A, that is floating around...
There is a sprite color distortion that takes place immediately after a few steps in the game, in any graphics mode, windowed, full screen, Direct3D, non Direct3D, whatever... This bug doesn't occur in Steem SSE 3.9.0 though.
Run the game in both cases, via GIAACSI.TOS, installed in a Megafile 60 HDD, downloaded from Steem SSE Home Page.
Any ideas?