title: Simulation of VHDL file on Quartus 13
body: <p>Over past days the option "Run Functional Simulation" (in waveform part) in Altera Quartus 13 here (i use in Ubuntu 11.10) was working fine, but since yesterday It, all of sudden, is not working. When I click in the option, it's opened a tiny grey retangle, and so it disappears. In other words, simulation doesn't work. Does anyone knows how to solve this problem?</p>
  
  <p>Best Regards,
  Inácio.</p>