My screen locks up every time I close a pop up window or move around in a listing

[oldplug1]

I have 3 ebay windows open on macbook pro. 2 were locked up. I check tracking on a purchase on the 3rd window, when I closed the tracking pop up the screen freezes. curser moves but wont move page or click on anything. If i refresh the page it works until i close a pop up or window within a listing.

then it locks up again. Any ideas on how to fix it?

Thanks,

Jim