I'm unsure what I have changed on my system that could have possibly caused this issue, but QTTabBar was working one day just fine and now all of a sudden I can't see any tabs at all. I have imported my settings from another computer, I have uninstalled and reinstalled. But the option to even use the tab bar is not available under View->options.
I tried to post an image of the optiosn. my only options are:
Change folder and search options
extra view (left)
qt command bar (vertical)
extra view (bottom)
qttabbar - bottom