If you are using NSM Morphine Theme for the control panel and have updated to EE version 2.1.3 you might be seeing some funky CSS conflicts in CP navigation menu (arrows messed up, spacing on active top level nav links is off).
This CSS will help:
#navigationTabs li li.parent:focus > a, #navigationTabs li li.parent.active > a {
background-color: inherit;
}
#navigationTabs li li.parent:focus, #navigationTabs li li.parent.active {
background-image: url("../../images/bg/nav_arrow_light.png");
background-repeat: no-repeat;
background-position: right center;
}
#navigationTabs li li.parent:focus > a:after,
#navigationTabs li li.parent.active > a:after {
content: none !important;
}
#navigationTabs > .parent:focus > a:after,
#navigationTabs > .parent.active > a:after {
content: none !important;
}
#navigationTabs > li.parent.active > a {
padding-right: 25px;
}It isn’t perfect but it does fix the most distracting bits.
Add it to the end of /themes/third_party/nsm_morphine_theme/styles/screen/cp_tweaks.css