Hi,
  you have a problem with asp.net
  Test this link http://www.bilocenter.com/dwzCaptcha/CreateCaptcha.aspx?AspNet=yes&dwzSessionname=CAPTCHA&dwzImageWidth=110&dwzImageHeight=32&dwzCodeLength=8&dwzRandomColor=true&dwzFontColorFrom=&dwzFontColorTo=&dwzShadowColor=&dwzBGroundColorFrom=&dwzBGroundColorTo=&dwzBGroundImage=&dwzFontList=Arial|Times%20New%20Roman|Georgia|Verdana|Tahoma&dwzBrushType=2&dwzDistort=true&dwzDisturb=true&dwzDistortLevel=12&dwzCharsType=2&dwzTextString=DRV5BZBL
  and resolve the problem
  Gianluigi
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