The Gear tool on your video toolbar is set to AUTO to avoid buffering. Alternatively you can choose to lock to any specific bitrate setting.

If you are having any trouble streaming please try: 

A. A wired ethernet connection. (Not wifi.) 
B. Confirm no other computers are sharing your network. 
C. Confirm no other programs are running on your system or device. 
D. Right-click the Flash video player and disable hardware acceleration in Flash settings. 

E. Update your Flash player then restart your browser.