[Wine] Strange colors in wine-1.1.38 playing The Witcher

[doctordruidphd]

An issue has appeared in wine-1.1.38 while playing The Witcher. Many of the plants that should appear green are now bright orange. Reverting to 1.1.37 or earlier fixes the problem. 
This is kubuntu-9.10 64-bit system with NVIDIA 190.53 and 195.36.03 (tried both, same problem) drivers. Compositing disabled. The game is otherwise playable.
Is there some configuration setting that has changed with 1.1.38?