I have also noticed that the "folder view" tabs do not work well at all. I have had to do a restart four separate times while trying to set these up.
I have had issues with "folder view" tabs also, including having to quit OD several times. In addition, I have had issues with the background color of the folder tab. I had another tabbed dock (not folder view) that had a black background. Even though I changed that dock to a default theme, the "folder view" tab still has a black background. Not sure what else to try short of resetting all my docks and rebuilding them from scratch.
Oh, one more thing about folder-view.... Maybe its just me, but when creating a new "folder view" tab a dialog box comes up titled "Choose a Folder", but I cant actually choose a folder... I have to choose a file in that folder?!?!?!? Annoying if the folder I'm trying to choose only has folders in it. I know I can temporarily put a file or shortcut in there so I CAN choose it, but I shouldn't have to. And, because of this there is no way to choose "My Computer" for a folder view tab.