xforms:send submission not working in Liferay

Hi I am using latest nightly build orbeon 3.7 with liferay 5.2.1

Here submissions called using  xforms:send submission are not working where as xorms:submit works

This works fine in BETA version of Orbeon 3.7

EG:
<xforms:action ev:event="DOMActivate">
                    <xforms:setvalue ref="instance('files-instance')/action">simple-upload</xforms:setvalue>
                    <xforms:send submission="background-submission"/>
 </xforms:action>