When "do not display guests ..." this declaration doesn't fit no more:
html[dir="ltr"] .ipsGrid_span12:nth-child( 1n ),
html[dir="ltr"] .ipsGrid_span12 + [class*="ipsGrid_span"],
html[dir="ltr"] .ipsGrid_span6:nth-child( odd ),
html[dir="ltr"] .ipsGrid_span4:nth-child( 3n+1 ),
html[dir="ltr"] .ipsGrid_span3:nth-child( 4n+1 ),
html[dir="ltr"] .ipsGrid_span2:nth-child( 6n+1 ),
html[dir="ltr"] .ipsGrid_span1:nth-child( 12n+1 ) {
margin-left: 0;
}