title: Rstudio can't find the network path of the Rmd being knit
body: <p>The following error arises when knitting an Rmd document to HTML, <strong><em>if</em></strong> the Rmd document is located on a network drive (Windows), whereas an identical Rmd document located on my desktop knits just fine:</p>
  
  <pre><code>Error in normalizePath(path.expand(path), winslash, mustWork) : path[1]="M:/mynetworkpath/blahblah/MyMarkdown.Rmd": The system cannot find the path specified
  </code></pre>
  
  <p>No HTML output is created.</p>
  
  <p>The same failure pattern happens when saving an R Notebook Rmd. In fact, the Save operation <em>does</em> save changes in the Rmd to the document on the network, even while it reports that the Rmd cannot be found, but it fails to produce the HTML output.</p>
  
  <p>I suspect that this behavior may have not always occurred, making me wonder if an intermittently slow network connection could be involved. </p>
  
  <p><strong>EDIT:</strong> Sure enough, this morning the very same Rmd document now knits on the network! So, is knitr sensitive to slow network connections? How can I diagnose and/or work around this problem?</p>