system tray

The icon (see pix) has no description, no right click options, nothing. Anybody recognizes this? Looks like my computer slowed down so checking what is happening...

After a W10 update a few weeks ago, my task bar became 3 lines high and it became impossible to widen the System Tray area. I have tried various forum suggestions around icon sizing, etc, but nothing helps. There is plenty of room to widen the system tray area, which would have (in the past)...