Post all feedback on beta builds of the race viewer in this thread.
As of December 5th 2016 you can test beta (in-development) builds of the race viewer. These versions are far more likely to have bugs, so we only recommend using it to help us develop the game and/or if you are having trouble loading the latest stable build.
How to enable the beta viewer on your machine:
1. Open the 'Settings' page
2. Change 'Race viewer build' to 'Beta'
3. Save your changes
4. Report and issues you find in this thread
To ensure you are using the latest version:
Clear cache before trying any updates to the viewer when they are announced. The best way to be sure you have done this is actually to press CTRL+SHIFT+DEL and wipe "Cache" and "Offline website data" only for "all time".