On home go to the topbar using 1 left cursor
go to the left icon and press enter
You now see the dialog to select what to do
press left (actually twice should be 1 time ofcourse) and you r now on the X
Press enter
You r now back on Home, but the topbar buttons r gone.
They will reappear when mouse over or you send the cursor there.

h4. Steps to Reproduce
Still happening now