Summary: Fairly frequently I've been experiencing a bug where an empty tab or window in Safari is drawn so that instead of being all white, it has the background from an 'adjoining' tab or window. The tab is empty because its web page is still loading, or maybe the tab was created automatically when clicking a download link. The background of this empty tab looks exactly like the web page of the tab or window next to it (i.e., the tab you would see if you closed the empty tab). However, the background of the empty tag is totally non-functional, not a real, clickable web page. This bug causes a lot of confusion and frustration, because the empty tab looks exactly like a loaded web page. I wonder why my mouse-clicks don't work, and sometimes I think that my bluetooth mouse has stopped responding. Then eventually I figure out that it's not a real web page but just a dummy background image. If I close the empty tab, then I get to the real, functional web page where the empty tab's background came from. Steps to Reproduce: I don't have exact steps to reproduce. It happens in several different circumstances: (1) When command-clicking on a link to open it in a new tab, and the new link is still loading; (2) when clicking on a link to download a file, and the link automatically creates a new tab or window before the download begins; (3) when I open a number of tabs in Safari from my external RSS reader and then switch to Safari to read the articles. Expected Results: The empty or loading tab should have a plain white background. Actual Results: The background of the empty or loading tab looks just like the contents of another tab. However, the background is totally static, non-functional: you can't click on any links, for example. Regression: I'm using Mac OS X 10.4.11 Build 8S2167 on a MacBook Pro 2.33 GHz Intel Core 2 Duo. I don't recall exactly when this bug started happening, but it certainly didn't happen in older versions of Safari.