There is a problem with the default activation definition found in the default.xml file. The "revision round" sub is not working ok if a publisher is rejecting the activation. The content is sent back to the editor but the editor can't publish it again to the publisher!
I saw that the inbox is not shown for an editor but I think that it is a feature that must be enable!
I have found a quick way to fix this problem:
Replacing :
"
<while test="${field:action} == reject"/>
"
with
"
<while>
<equals field-value="action" other-value="reject" />
</while>
"
and
"
<process-definition name="to-publisher">
<participant ref="group-publisher"/>
</process-definition>
"
with
"
<process-definition name="to-publisher">
<sequence>
<!-- reset the assignTo field so the editor not longer see the workflow items -->
<unset field="assignTo"/>
<participant ref="group-publisher" />
</sequence>
</process-definition>
"

Hope this helps!
Thanks for your great work!