Pin/Unpin windows is not working

[wijjo]

I have tried pinning a window (Chrome) using the default key sequence [Left Win][Left Ctrl][Left Alt]+[P] and it does not make the window appear on all virtual desktops. I tried changing the key sequence to be sure that I wasn't mis-typing it. I could not get it to behave as a pinned window.

The Show Window on All Desktops command in the virtual desktop switcher screen still has the desired effect. So I know that window pinning works in theory.

I'm running an up-to-date Windows 10 Pro version 1607 OS build 14393.1066 and SylphyHorn version 2.5.0. I'm on a MacBook Pro 2013 running Windows under Boot Camp.

For what it's worth I had also attempted to use the recommended AutoHotkey script that toggles WS_EX_TOOLWINDOW. It also has no effect. See https://superuser.com/questions/950960/pin-applications-to-multiple-desktops-in-windows-10.

Thanks!