When printing a PM, there are the following errors:
subsilver2/template/ucp_pm_viewmessage_print.html

	<td colspan="2" align="center"><span class="Forum">{SITENAME}</span><br /><span class="gensmall">{L_PRIVATE_MESSAGING}</a></span></td>

</a> It is useless.

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prosilver/template/ucp_pm_viewmessage_print.html

<td colspan="2" align="center"><span class="forum">{SITENAME}</span><br /><span class="gensmall">{L_PRIVATE_MESSAGING}</a></span></td>

The same error.

The attributes align, width and nowrap(contained in the file) are not supported by Strict, only by Transitional. I think it should be changed to CSS or switch to Transitional.