When one page use html tag base the upload button not works because the href is just "#".
The href link for fileUpload could not be "javascript:void(0);" ?
<div id="mainForm:fileUpload:upload1"
class="rich-fileupload-button rich-fileupload-font"
onmouseup="this.className='rich-fileupload-button rich-fileupload-font'"
onmouseover="this.className='rich-fileupload-button-light rich-fileupload-font'"
onmouseout="this.className='rich-fileupload-button rich-fileupload-font'"
onmousedown="this.className='rich-fileupload-button-press rich-fileupload-font'"
onclick="return $('mainForm:fileUpload').component.upload();">
<a class="rich-fileupload-button-selection" href="#">
<div id="mainForm:fileUpload:upload2"
class="rich-fileupload-button-content rich-fileupload-font rich-fileupload-ico rich-fileupload-ico-start">
<a>
<b>Upload</b>
</a>
</div>
</a>
</div>