title: Document compiling in one instance, but not the other (Beamer)
body: <p>So, I'm not sure whether this has happened to anyone else, but I'm using Rmarkdown to create a beamer presentation. For whatever reason, there are some .Rmd files that are compiling, while others constantly go into "extended mode". </p>
  
  <p>For instance, if I create a brand new .Rmd file, it will compile, but if I copy the contents of the document into another file (same exact thing), it goes into extended mode looking for pgf. Any understanding of why this might be the case?</p>