As of a week ago I have the same prob, IDK what broke it a MS update I assume, ffor me a simple fix is to open WB after a reboot, settings, show ribbon. Apply. go to WB settings hide ribbon, apply. Works for the session.
Latest WB version
All windows, explore browsers, ect. I can see the buttons but clicking on them opens the search window for example in explores. In browsers ( chrome ) it opens my pinned extensions.
I will fire up a SS and full specs later, heh it is almost Xmas and SG is a busy guy.