Confirmed, opening the Cortana search box does trigger it (although not every time, at least for me).
Additionally, clicking on the "show hidden icons" pointer does not always bring the icons back...sometimes several clicks are necessary.
And more additionally, enabling auto-hide on the taskbar doesn't work at all...the taskbar will hide for a moment, and then come back into view. The only time I use auto-hide is to temporarily resize windows that are larger than the desktop area (usually in an RDP session), and I noticed this yesterday.
