title: tinn-r 2.4.1.5 does not pass zoomplot
body: <p>I recenty installed R 3.0.0 passing the commands through Tinn R 2.4.1.5</p>
  
  <p>I tried to use the function zoomplot(locator) from TeachingDemos </p>
  
  <p>I got the error below:</p>
  
  <blockquote>
    <p>Error in .Primitive(".External2")(c(2799.10559440559, 2848.00769230769,  : 
     first argument must be a string (of length 1) or native symbol reference</p>
  </blockquote>
  
  <p>Interstingly enough, everything else being equal the function works fine with Tinn-R 1.7 </p>
  
  <p>I am running R on a Windows XP 32.</p>
  
  <p>Any suggestion will be greatly appreciated.</p>
  
  <p>Best wishes,</p>
  
  <p>Heriberto</p>