Hello, you must have an account to connect to the game. then you'll see that there are some traces while looking at items properties... For example, go in the general view et pass the mouse on the different items you have. You will see that there is some border of the rectangle that left displayed as you move the mouse. Can't we add some screenshot (1st bug report ever...) ? Thanks to have a look!
Created attachment 14931 [details] here is a screenshot
I've tested the site in the latest Webkit r30628 in Leopard and I cannot confirm the problem. There was no artifacts generated. I resolve the bug as WORKSFORME. arnoud, feel free to reopen the bug if you still experience the problem in the latest Webkit.