Havent seen this before,and found no search hits on here. I have my Safari preferences to "Automatically" open a new tab with a new link open. When I do this within Safari it works as expected (adds a tab to the right of all open tabs). I also have the "make a new tab the active window" option checked which works fine. However when I click on a link in an e-mail (in OS X Mail 6.2 (1499)), instead of the above behavior it overwrites a random tab in Safari and makes it active. Whatever was in that old tab (might be the third tab in an inactive window) is gone. Only way I can get it back is to reopen windows from last session. Heck, I cant even figure out how it is deciding which tab to randomly overwrite. It hasn't always been like this. And the only major change I have made recently is last week's Macbook Air and Macbook Pro 2.0 updater for mid-2012 machines. Any ideas? I have trashed the ~/Library/Preferences/safari...plist file and it made no difference.