Ah you're right, looks like I forgot again. Fixed it on my localhost, Ill give it another day or so for any more bugs and Ill release it. If you want a quick fix, open EXTRA.css and pop this in.The double line in Responsive is still present from what I can see.
Code:
@media (max-width: @maxResponsiveNarrowWidth) {
.Responsive .messageUserBlock h3.userText {border-top: 0;}
}
Remember to remove it when I patch it.