Make sure you are not clicking on the link before the page fully loads. This is because the Javascript is only activated after the page is fully loaded.

Yup, the page is definitely fully loaded before clicking the link. I just tried it on this very install - works fine in IE, but in Firefox 1.5 just sits there saying "Loading...". I use FireBug in Firefox and it seems that the AJAX request is being placed and the <select> is being returned in the response - it just does not update the page itself.

Here is the Response according to FireBug (when clicking on "Product Build"):

<!-- show_build_filter --><!-- Build -->
<select name="show_build[]">
<option value="0" selected="selected" >[any]</option>
<option value="-2" >[none]</option>
<option value="Tarball / PHP 4.3.0" selected="selected" >Tarball / PHP 4.3.0</option><option value="strings_english.txt,v 1.175" selected="selected" >strings_english.txt,v 1.175</option><option value="Running on W2K" selected="selected" >Running on W2K</option><option value="running on Suse / Apache" selected="selected" >running on Suse / Apache</option><option value="Mar.8" selected="selected" >Mar.8</option><option value="latest CVS-Copy (11. Jul 03)" selected="selected" >latest CVS-Copy (11. Jul 03)</option><option value="latest CVS-Copy" selected="selected" >latest CVS-Copy</option><option value="incl. 0.18.0a2, 0.18.0.a3" selected="selected" >incl. 0.18.0a2, 0.18.0.a3</option><option value="IE5.5.4522.1800" selected="selected" >IE5.5.4522.1800</option><option value="cvs version from 2002-06-07" selected="selected" >cvs version from 2002-06-07</option><option value="CVS Version" selected="selected" >CVS Version</option><option value="CVS snapshot 02/06/2004" selected="selected" >CVS snapshot 02/06/2004</option><option value="cvs snapshot" selected="selected" >cvs snapshot</option><option value="cvs release from 2002-06-07" selected="selected" >cvs release from 2002-06-07</option><option value="CVS HEAD as of 24 feb" selected="selected" >CVS HEAD as of 24 feb</option><option value="CVS HEAD 20030219 and 0.18.0a1" selected="selected" >CVS HEAD 20030219 and 0.18.0a1</option><option value="CVS HEAD - June 14 2005" selected="selected" >CVS HEAD - June 14 2005</option><option value="CVS 02/06/2004" selected="selected" >CVS 02/06/2004</option><option value="CVS - April 2 - 23:17 GMT" selected="selected" >CVS - April 2 - 23:17 GMT</option><option value="CVS" selected="selected" >CVS</option><option value="current website version" selected="selected" >current website version</option><option value="current" selected="selected" >current</option><option value="checkout 21/08/2002" selected="selected" >checkout 21/08/2002</option><option value="B_001" selected="selected" >B_001</option><option value="Beta 2" selected="selected" >Beta 2</option><option value="a2" selected="selected" >a2</option><option value="??" selected="selected" >??</option><option value="4">4</option><option value="30.05.2004">30.05.2004</option><option value="28.05.2004">28.05.2004</option><option value="27.05.2004">27.05.2004</option><option value="23.08.2003">23.08.2003</option><option value="2004-10-19">2004-10-19</option><option value="16">16</option><option value="14">14</option><option value="127">127</option><option value="11.06.2004-12:02">11.06.2004-12:02</option><option value="10001">10001</option><option value="100">100</option><option value="1.00.a3">1.00.a3</option><option value="0.19.0rc1">0.19.0rc1</option><option value="0.18a4">0.18a4</option><option value="0.18.2-CVS">0.18.2-CVS</option><option value="0.18.0a4">0.18.0a4</option><option value="0.18.0a2">0.18.0a2</option><option value="0.17.2">0.17.2</option><option value="0.17.1">0.17.1</option><option value="0.16.1">0.16.1</option><option value="-" selected="selected" >-</option><option value="" selected="selected" ></option> </select>

Please see also 0006754. From info in that bug report, it seems possible there is a problem with an unrecognized character in the XmlHttpRequest's response. The only possibly weird part I saw in your captured output was this:

<option value="??" selected="selected" >??</option>

Is that actually what you want there? Two question marks? Or are those some other special characters that aren't being represented properly in the character encoding? If so, what are the characters, and what character encoding (what language) are you using?

The problem might be FireBug. Do you have 'Show XMLHttpRequests' turned on under 'Options'? If so, maybe you should turn it off.

Disabling Firebug "Show XMLHttpRequests" fixed the problem. Thank you so much - I should have thought of that!!