Downloaded yesterday, first test menu had some submenu names break at spaces to appear on two lines. Replacing spaces with underscore worked, but underscores visible on mouseover. Tried turning off auto width, but most submenu names broke, turned auto width back on, may have done other things, then started working with all items on one line. So built horizontal menu for entire site, and all seemed well. Today I noticed two of the seven submenus were broken. I was using Firefox. Tried looking at site in Chrome, and all was right. Found a post from six months ago, same issue, fix offered was:

Add the next CSS rules to "CSS Styles" parameter in module settings:

Code:

.ux-menu-sub LI A
{
white-space: nowrap !important;
}

.ux-menu-hidden
{
display: none !important;
}


Tried it and it worked. So I'm a happy camper. Just thought I'd share my discovery that issue is associated with Firefox. Example image attached.