I have a mac book and was using cookie clicker. However, in order to keep earning cookies you need to keep it on, so on a trip, i lowered my brightness all the way down (leaving it looking like it was off), plugged it in and let it open while we were gone (one week). When I turned up my brightness to see how it was doing, I was happy to see i had over 180 trillion cookies. (PROBLEM STARTS HERE) However, after used all my cookies to purchase many items, I started scrolling through and noticed a faint water mark on the page from where I left it on the trip. I refreshed the page, however it wouldn't go away! I didn't think anything of it until i noticed it was stuck on my entire screen no matter what I went on! Tried restarting my computer and turned it off and on multiple times, but the mark remained. The only time it isn't there is when the brightness is all the way off or when the computer itself is off. I'm not sure if it's the computer or the cookie clicker, but if you know what to do PLEASE HELP!!!!