updated known issues

extension/ui/pages/help.html

@@ -468,9 +468,11 @@
 						<ul>
 							<li>For security reasons, you cannot save pages hosted on https://chrome.google.com or
 								https://addons.mozilla.org.</li>
-							<li>The last saved path cannot be remembered by default. To circumvent this limitation, disable the option "Save
-								pages in background".</li>
+							<li>The last saved path cannot be remembered by default. To circumvent this limitation, disable the option
+								"Misc. &gt; Save pages in background".</li>
 							<li>The following characters are replaced with _ in filenames: ~, \, ?, %, *, :, |, ", &lt;, &gt;</li>
+							<li>If the filename of a saved page looks like "56833935-156b-4d8c-a00f-19599c6513d3", disable the option "Misc.
+								&gt; Save pages in background"</li>
 						</ul>
 					</li>
 					<li>