As it sits, the custom pages aren't Valid XHTML 1.0 Transitional. In order to make them so, do the following:
In each vbindex_customblock_# template:
Find:
HTML Code:
<table cellpadding="$stylevar[cellpadding]" cellspacing="$stylevar[cellspacing]" border="0" width="100%">
<tr>
Replace with:
HTML Code:
<table cellpadding="$stylevar[cellpadding]" cellspacing="$stylevar[cellspacing]" border="0" width="100%">
<thead>
<tr>
Find:
HTML Code:
</tr>
<tbody id="collapseobj_vbindex_customblock$box" style="$vbcollapse[$collapseobj_vbindex_customblock]">
Replace with:
HTML Code:
</tr>
</thead>
<tbody id="collapseobj_vbindex_customblock$box" style="$vbcollapse[$collapseobj_vbindex_customblock]">