Echo is totally inaccessible from the Modern skin.
Primary cause is that modern sets p-personal to 'overflow:hidden', hiding the overlay which is outside of it's parent box. I'm not really sure WHY the skin has overflow hidden, it doesn't seem required on first look.
After fixing that, it is still shown partially outside of your screen, because p-personal is left aligned on modern (and cologne blue). The positioning of Echo does not account for this in any way (it uses left: -200px;). Additionally Modern sets an explicit height for <ul> elements (regardless of being direct descent dents) which makes the notifications area very small.