[TheAdminMarket]

I'll check your suggestion and I'll come back. Meanwhile I was checking the template MEMBERINFO and I found something that can helps, but still haven't tested it.

{vb:raw template_hook.profile_tabs_first}
<vb:if condition="$blocks[activitystream]"><dd<vb:if condition="$selected_tab == 'activitystream' OR $selected_tab == ''"> class="userprof_module" <vb:else /> class="userprof_moduleinactive" </vb:if>><a id="activitystream-tab" href="{vb:link member, {vb:raw userinfo}, "tab=activitystream"}#activitystream" onclick="return tabViewPicker(this);">{vb:raw activity_phrase}</a></dd></vb:if>

That OR $selected_tab == ''" I think that it makes the tab "My Activity" to be default. Tried to remove it but I got parsing error when during saving. I'll give one more try.

--------------- Added [DATE]1412791348[/DATE] at [TIME]1412791348[/TIME] ---------------

Unfortunatelly your solution does not works, so I need to try with the template. That:

$vbulletin->GPC['vmid']

means (most probably) "Visitor Message Id"