I have seen that on Opera 11 when I hover the mouse across the Browser Window; the buttons remain highlighted for some time. Actually the issue is not only with the buttons that are there on the Widow but the similar issue is observed with the taskbar buttons. I have seen that it just leaves some trails or say a shadow can be observed to be left. I am using the skins on the Opera 11; but I really do not think that it can be the reason for the issue.
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