title: Recurrent message "Cannot navigate to the symbol under the caret"
body: <p>I'm using Visual Studio 2015 CE. About a week ago I started seeing a message box showing the error mentioned in the subject. It happens only if I try to open a .cs file and it's completely preventing me from working :(.
  I also noticed that the projects in my solution are being "lazy loaded". That means that I open the solution and in the solution explorer I see my projects listed with a label that reads "(loading)". Once I click on them, they get loaded.</p>
  
  <p>I think it could be due to a windows update, probably, because I also noticed that while working with the browser (Chrome or Edge) F12 seems to be automatically pressed because the developer tools are opened randomly. That kind of makes a consistent pattern with the issue in VS. I uninstalled the latest updates but still have the issue.</p>
  
  <p>Now, I don't thing there's something wrong with my keybord, even that's possible. 
  I saw many posting about this issue but couldn't find a solution yet. 
  Does anybody know what could be wrong here? I'm about to completely reinstall my computer.
  Thanks!</p>
  
  <p>Gonzalo</p>