I've noticed this problem with AT&T wireless's website. When I first load up the website (attwireless.com), the textbox for "Wireless Number or Member ID:" is highlighted. While that textbox is highlighted, I am unable to use the shortcut key to log in (command + \). If I tab out of that text box (ie. to go to the password box) or if I click somewhere else on the page, then I can use the shortcut key to log in again. I've noticed this with Safari 4 and now 5.
Comments
You're very welcome!
I did find a partial workaround to their JavaScript. If you use this URL and tab to the password field (or click somewhere outside of the fields) you can then use your keyboard shortcut to select/Fill a Logins. For a keyboard-only user that click is probably not what you want, but it might help others that don't want to use tab (a little something for everyone!).