I had an incorrect fix for issue2550601. Changed schema to define class patches not patch. Changed commented out patches section in bug.item.html to use patches-1 an not patch-1 as a result of schema changes. The show open Milestones link had a leak of the @group value. If you clicked on show open tasks or show open bugs they group by priority. The url being formed for show open milestones was inheriting the @group if you were on an index page for bugs or milestones. Explicit set the @group to status (which a milestone does have) prevents the @group=priority from being applied to a milestone index page which results in a red error banner stating priority is an invalid param for milestones. ./demo.py -t devel now runs without obvious breakage.

<tal:block metal:use-macro="templates/page/macros/icing">
<title metal:fill-slot="head_title"
 i18n:translate="">Registration in progress - <span i18n:name="tracker"
 tal:replace="config/TRACKER_NAME" /></title>
<span metal:fill-slot="body_title" tal:omit-tag="python:1"
 i18n:translate="">Registration in progress...</span>
<td class="content" metal:fill-slot="content">

<p i18n:translate="">You will shortly receive an email
to confirm your registration. To complete the registration process,
visit the link indicated in the email.
</p>

</td>
</tal:block>