The errors on the W3C validator that concern me most are the </li> tags that aren't closed
Example: Line 1245, Column 692: end tag for "li" omitted, but OMITTAG NO was specified
I looked at it a little more... you put in some custom css that's screwing up your submenus
ul.menutop li.root > .item > span {
padding-top: 12px;
padding-bottom: 12px;
}
it's the padding-bottom specifically... you create a gap that a mouse cursor can't traverse and so the submenu doesn't stay in "hover" mode if you will... you should always test any custom code thoroughly AND mention it in a forum post if youre having an issue with an element you've put some custom styling on
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