Current;y running ML. But have have had same with Lion. Glitches, or little(?)abnormalities that should not be there. For instance, I have a box that covers perfectly the MacRumors logo when I go to that page. As soon as I scroll up the box stays while the text moves. Don't know how or why this started, but it is annoying. Tried a fresh reinstall, but nothing. So, do you guys just live with the quirks? I don't think it's affecting performance...... Comments? Eduted to add: This is not a ML only question. It happened in Lion as well.