3.0.10 version of styles/subsilver2/template/posting_buttons.html still has an error in the [*] helpline.

<input type="button" class="btnbbcode" accesskey="y" name="addlistitem" value="[*]" style="width: 40px" onclick="bbstyle(-1)" onmouseover="helpline('e')" onmouseout="helpline('tip')" />

In above onmouseover="helpline('e')" should be onmouseover="helpline('y')" ("e" changed in "y").

Also refer to PHPBB3-10554