A strange bug is occurring with the "Current Navigation" feature, whereby for some users (on all browsers), the sub-links (second level link) within the "Current Navigation" aren't appearing when the page loads, preventing users from navigating the site. They flash for an instance, but then disappear after half a second. Really strange because this is isolated to only a couple of users!
Editing the list displays all the links, and all are set as visible.
Any help would be much appreciated