Marco,
Thank you very much for this suggestion. It solved the grey window
problem, which makes octave plots interactively presentable.
To pass the command line options to the Xserver:
Change the command in the Win 'Xwin Server' short cut icon, the
target field, to
C:\Cygwin\bin\run.exe /usr/bin/bash.exe -l -c
/usr/bin/startxwin-script
Write a simple bash script in /usr/bin/startxwin-script that contains
/usr/bin/startxwin.exe -- -multiwindow -nowgl
The script is needed, since in the context of C:\Cygwin\bin\run.exe,
arguments to the bash.exe -c option do not seem to get passed.
So, for example, the following does not work:
C:\Cygwin\bin\run.exe /usr/bin/bash.exe -l -c /usr/bin/Xwin
-multiwindow -nowgl