I am having the same problem, I just had to adjust my dep setting to be able to play the demo. After purchasing the game and my hour is up, the unlock and buy buttons do nothing. I have disabled any pop up blockers and javascript is enabled. I am running vista, and I had vv 4 on my computer, just the demo and after a while it seemed to encounter this problem as well. I will be trying to see if I need to update/replace any java files and testing it on another computer in my home. Thank you for your time.