title: Is this a Ghdl/gtkwave bug?
body: <p>I'm using ghdl+gtkwave for studying, on Windows 7.
  I run simulations by calling some shell in a .bat file, usually when I got some sintax error, i see the messagges in dos window, but in some case that I didn't understand, there are no errors but gtkwave doesn't runs. </p>
  
  <p>Is this a bug?</p>