Here's a peculiar one - 'Back' button failure is site-specific and reproducible:
- go to
http://www.cnn.com/
- click the BUSINESS button at upper right, to go to
http://money.cnn.com/
- the 'Back' Alt+LeftArrow function doesn't, and 'Back' is greyed out in the Go menu.
CNN.com is visible as the most recent page in the Go menu, and does work.
Needless, to say, this doesn't happen with other browsers, or, for me, with other sites...
Regards...