I'm using Safari 5.0.3 on Mac OS X v. 10.6.6. When I try to edit a chat post in English.SE to fix a typo, selecting text and hitting the backspace key (for delete) often for some strange reason will send me to the main page of the Stack Overflow site. I find this rather bizarre behavior prevents me from making the edits within the narrow timeframe allowed. Surely this cannot be FAD behavior, can it?
Also, if I forget I'm on the Mac and try holding down the option key and typing 0151 on the number pad (equivalent to Alt-0151 in Windows) to make an em dash, I similarly get dumped to main page of SO. What is triggering this jump to SO?
Edit: This is a virgin install of Safari, with no plugins or addons. Also, the SO main page is not in my history queue when this happens, either.