Other thoughts A reader wonders whether all of this may somehow be related to the fact that, when using the Back and Foward buttons in Netscape, the browser always seems to take awhile to reload the page (as compared to Internet Explorer, where the page often pops into view). This may imply some more general problem with how Netscape products cache web pages. Similarly, David Craig notes (as covered here on MacFixIt before) that Netscape's "Super Reload" (holding down the Option key when selecting to reload) works differently (or not at all) in different versions of Netscape. At one time, the phrase Super Reload would actually appear in the View menu when you held down the Option key. This no longer happens.
Update: You can get Super Reload to appear in the Views menu: Press and hold the Option key while a page is loading. Do not let go of the Option key. When the page finishes loading, go to the View menu. Super Reload will be there and selecting it should work. (Thanks, Jon Mircea and Chris Stone.)
Actually, as noted here on MacFixIt last year (alas, I did not recall this), holding Shift or Option should get the Super Reload in Communicator or Navigator 4.0.5.