The keyboard locks up in Netscape 4.7 after choosing an item from a <SELECT> drop down box with a long list of items. I created an example demonstration of the bug at http://www.taco.org/foo.html . This makes it impossible to fill out a whole bunch of forms out there!
Can't reproduce this here. There is a known problem with the focus in regard to some select lists under some window managers; try focusing a different window, and then reselecting netscape.
*** This bug has been marked as a duplicate of 6409 ***