When disabling the Android drawer menu, the bottom menu is only visible on screens that provide "built in" features. Choosing a menu item that pulls in info from RSS, the website etc. will make the menu disappear.
UPDATE: after more testing it turns out that this ONLY happens when clicking on tiles on the home screen that iFrame in external pages! iFramed pages being pulled in from the "More" menu bar don't show that behavior. Hope, that helps?!?!