System: Mandrake Linux 8.0, Mozilla 1.0RC1. Set your character coding to Western and auto-detect to Japanese. Go to http://www.csse.monash.edu.au/cgi-bin/cgiwrap/jwb/wwwjdic . Enter the word "mori" to search for (any word works, actually). You will get the first page of results. After the list should be a "Continue" button and a "Continue displaying results" selection. Leave the selection alone and press the "Continue" button to get a second page of results. You will get a POSTDATA warning twice, which means that the page has loaded from the server three times. Moreover, attempting to view source on the resulting page will give another POSTDATA warning even though "view source" in RC1 is no longer supposed to reload from the server. Note that the first and second pages have the same content type, yet this only happens on the second page. Everything works fine on the first page, including "view source". Also note that if you set autodetect to "off", this doesn't happen.
Thank you for the report. This is a known issue. *** This bug has been marked as a duplicate of 61363 ***