It's a change that Windows 7 made to Java.  Edit the mason.bat file  
and remove the word

	-server

Sean

On Jun 28, 2010, at 6:30 PM, Edith M wrote:

> I am trying to run mason on windows but if i double click the  
> mason.bat file all
> i get is a command prompt window that shows in a flash and then  
> disappers. If
> i run it on Linux i dont get such poblems. Can anyone help me please.