If you're using the google chrome browser and you're not able to view measure documents or view the markups/comments, this article may help you.
By default the google chrome browser disables the adobe pdf viewer and enable's it's own pdf viewer instead. The google pdf viewer does not include many of the features that are available in the adobe version such as measurements and comments/redlines. However you can manually disable the chrome pdf viewer and enable the adobe version which should resolve your problems.
To disable the Chrome PDF viewer and revert to Adobe Reader, follow these steps:
1. Type "about:plugins" in the address bar (without the quotes)
2. Hit enter
3. Click on details (near the top right)
4. Disable "Chrome PDF Viewer" and enable the Adobe one
Chrome will now use the adobe pdf viewer instead of the built in google version and you should now be able to make use of the extra features.