title: continue color scale is not working in ggplot2_2.0.0 in windows remote desktop
body: <p>it seems continue color scale is not working in the latest version of ggplot2 (2.0.0) when I use window remote desktop (Window 7 SP1 enterprise)</p>
  
  <p>This is my test code:</p>
  
  <pre><code>library(ggplot2)
  
  ggplot(cars) +
      geom_point(aes(speed, speed, colour = dist))
  </code></pre>
  
  <p>The figure doesn't show the color bar in  the legend. </p>
  
  <p><a href="https://i.stack.imgur.com/YNDsk.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/YNDsk.png" alt="enter image description here"></a></p>
  
  <p>The same code is working on local windows laptop and remote Linux server.</p>
  
  <p>Any suggestion to fix this problem.</p>
  
  <p>My session info</p>
  
  <pre><code>R version 3.2.2 (2015-08-14)
  Platform: x86_64-w64-mingw32/x64 (64-bit)
  Running under: Windows 7 x64 (build 7601) Service Pack 1
  
  locale:
  [1] LC_COLLATE=English_Australia.1252  LC_CTYPE=English_Australia.1252    LC_MONETARY=English_Australia.1252
  [4] LC_NUMERIC=C                       LC_TIME=English_Australia.1252    
  
  attached base packages:
  [1] stats     graphics  grDevices utils     datasets  methods   base     
  
  other attached packages:
  [1] ggplot2_2.0.0
  
  loaded via a namespace (and not attached):
   [1] labeling_0.3     colorspace_1.2-6 scales_0.3.0     plyr_1.8.3       tools_3.2.2      gtable_0.1.2    
   [7] Rcpp_0.12.3      grid_3.2.2       digest_0.6.9     munsell_0.4.2   
  </code></pre>