Jumpy/flashing characters in Jumpstart game

I am playing the online Jumpstart game on my Windows XP PC. The characters in the game constantly flash, looking as if they are sending rays out from themselves. I have contacted Jumpstart support and tried clearing cache, uninstalling and reinstalling the unity web player, updating the video driver, clearing Internet Explorer cache - all with no effect on the problem. This problem does not occur on our other (Windows 7) PC. Any idea what is wrong?

This site is for people using unity for questions about development in unity. Not for end-users of content created with unity. Only the creators of the game you mentioned can help you if you have a problem with their game.