The control name for adding a list item has a typo, "addlitsitem", instead of "addlistitem". This occurs in the following places:

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\adm\style\acp_users_signature.html(59): <input type="button" class="button2" accesskey="y" name="addlitsitem" value="[*]" style="width: 40px" onclick="bbstyle(-1)" onmouseover="helpline('e')" onmouseout="helpline('tip')" />
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\styles\prosilver\template\posting_buttons.html(82): <input type="button" class="button2" accesskey="y" name="addlitsitem" value="[*]" style="width: 40px" onclick="bbstyle(-1)" title="

" />
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\subsilver2\template\posting_buttons.html(48): <input type="button" class="btnbbcode" accesskey="y" name="addlitsitem" value="[*]" style="width: 40px" onclick="bbstyle(-1)" onmouseover="helpline('e')" onmouseout="helpline('tip')" />

Search complete, found 'addlitsitem' 3 time(s). (3 file(s)).