What doesn't work? what are you expecting to happen?, you shouldn't get a white screen you should get the headers, footers..etc but nothing in between.
--------------- Added [DATE]1372549477[/DATE] at [TIME]1372549477[/TIME] ---------------
Right just checked, you cant wrap the entire MEMBERINFO, you have to be a bit smarter and wrap waht you need so possibly just wrap from
HTML Code:
<!-- begin user css -->
<div id="usercss" class="floatcontainer">
<div id="content_container">
ADD THE CONDITION HERE
<div id="content">
and then add the </vb:if> before the last DIV on the template

, so that woyuld be here
HTML Code:
<!-- end usercss -->
ADD </vb:if> HERE!
</div>