In 2.1 the extra CSS file from Optimus is effectively breaking some standard screens.
@media screen and (max-width:720px) {
th,td:first-child{display:none}
td input{display:block;width:100%}
input[name^=custom_tag_]{width:100%}
div[class=min]{float:none;width:100%}
}
This code : th,td:first-child{display:none}
Is making the notifications settings in the admin area SMF unusable by hiding the first column in tables...