The default.css file that ships with dnn601 has an error in it:

a[disabled].dnnPrimaryAction, a[disabled].dnnPrimaryAction:link, a[disabled].dnnPrimaryAction:visited,a[disabled].dnnPrimaryAction:hover, 
a[disabled].dnnPrimaryAction:visited:hover,dnnForm.ui-widget-content a[disabled].dnnPrimaryAction{
text-decoration:none;color:#bbb;
background:#656565)) -webkit-gradient(linear bottom;
filter:progid:DXImageTransform.Microsoft.gradient( startColorstr='#818181', endColorstr='#656565',GradientType=0 );
-ms-filter:"progid:DXImageTransform.Microsoft.gradient( startColorstr=#818181, endColorstr=#656565,GradientType=0 )";cursor:default
}

Should be more like this below - basically the background definitions are messed up:

a[disabled].dnnPrimaryAction, a[disabled].dnnPrimaryAction:link, a[disabled].dnnPrimaryAction:visited,a[disabled].dnnPrimaryAction:hover, 
a[disabled].dnnPrimaryAction:visited:hover,dnnForm.ui-widget-content a[disabled].dnnPrimaryAction{
text-decoration:none;
color:#bbb;
background:#656565;
background:-moz-linear-gradient(top, #818181 0%, #656565 100%);
background:-webkit-gradient(linear, left top, left bottom, color-stop(0%,#818181), color-stop(100%,#656565));
filter:progid:DXImageTransform.Microsoft.gradient( startColorstr='#818181', endColorstr='#656565',GradientType=0 );
-moz-border-radius:3px;border-radius:3px;
text-shadow:0px 1px 1px #000;color:#fff;
text-decoration:none;font-weight:bold;border-color:#fff
}

Westa