Comment 15 for bug 1650977

My setup is dual-monitor. The right monitor is my primary display.

I can confirm that changing the primary display to the left monitor results in the icons appearing on each reboot (and aligned neatly).

Switching the primary display back to the right monitor makes the icons disappear on reboot and arranges them randomly.

So it does appear related to which monitor is the primary display.

Although it is probably unrelated, using the right monitor as the primary display (or, more generally, not using the left monitor as the primary display) has always been troublesome. Some programs tend to open on the left monitor, regardless of settings or previous window placement.