XWin Won't Run Without -screen Option

[Harold Hunt]

Hon-Chi,

>   winInitVisualsShadowDDNL () - Masks 0000f800 000007e0 0000001f
> BPRGB 6 d 16
>      0 [main] XWin 2016 open_stackdumpfile: Dumping stack trace
> to XWin.exe.stackdump
>   Arithmetic exception (core dumped)

Your problem has nothing to do with the :0 or -screen parameters.

Something else is going on.  Try Test42 and report your results to the list:
http://xfree86.cygwin.com/devel/shadow/

Harold