http://bugs.winehq.org/show_bug.cgi?id=18833
--- Comment #5 from Jamieson Christian jamiesonc2@gmail.com 2012-05-27 10:57:02 CDT --- (In reply to comment #4) Note that the Unity menu bar on my machine is 24 pixels high, which explains why WINE used 1680x1026 as the size for the virtual desktop window in Use Case 2. (On Display 1, this would have precisely filled the space available to programs.)
It seems that although WINE now comes up on the correct display, based on where it was launched, it always uses the Display 1 resolution to decide (1) whether the virtual desktop can be made to the size specified in winecfg, and (2) whether the virtual desktop is to be fullscreen or windowed.