Hi Dan,
in vg-ddraw-d3d.txt:
Conditional jump or move depends on uninitialised value(s)
at ??? (in /dev/zero)
by surface_load_ds_location (surface.c:4504)
by IWineD3DDeviceImpl_SetDepthStencilSurface (device.c:6273)
etc
It seems that this happens in a function that the compiler inlined. Can you compile Wine with -O0 to have more debug info?