I don't think this is a bug per se - more of a slight inconvenience? But I was just moderating when I noticed that when I'm in the "Moderate" tab (http://the-planning-board.minitokyo.net/moderate), the "Settings" and "Content" tabs disappeared. I had wanted to jump to the content tab after I finished moderating members, but I had to click back out onto the main group page to access that tab again.
P.S. I also just noticed that when I'm in the "Gallery CP" tab - http://the-planning-board.minitokyo.net/gallerycp - ALL of the tabs across the top (moderate/settings/content/etc.) disappeared o.o;;