If you're experiencing Flash crashes or white screens and you've already tried running through the basic troubleshooting steps, there are a few more things you can try; the following three steps will address the most common contributing factors.
- Try loading the game on a different browser; Chrome or Firefox, if possible.
- Disable PepperFlash and ensure you're only running one version of Flash.
- Re-install or update your Flash player.
Some steps above link to an article that should walk you through the process.