• VSCode Version: 1.7.1
• OS Version: osx 10.11.6

Steps to Reproduce:

1. Create a file with random text.
2. Open it with vscode and TextEdit for example.
3. Edit the file in TextEdit and save it.
4. The file was refreshed in vscode.
5. Keep editing the file in TextEdit and save it.
6. vscode don't refresh the file only the first time, after that no more refresh occur.

side note: after editing the file in vscode and try to save it, and it shows a upper popup telling that the file has some diferences from the original and open a compare window.