Comment 20 for bug 1650977

Glenn, I tested your Left monitor icons suggestion and you are right.
When I move my primary monitor to the left position (In System settings - Display), my disappearing icon problem is gone.
Even after a reboot I do not have to use your F5 trick to get the icons back because they are still there after a reboot even if I have my second screen on.

Glenn, I might have some advice that might help or at least get you closer to the solution:
My video card is onboard my mainboard so I do not have an added video card.
It has 3 outputs:
1) An old stile analog 15-pin DE-15 connector
2) A DVI connector
3) A HDMI connector
My LG 55” TV and my primary LG 34” Ultra Wide-screen both have HDMI connections.
Therefor I used a DVI-to-HDMI converter on my DVI port.
I found that my DVI output was the first detected hardware and de HDMI output was the second.
Therefor I switched both HDMI connections on my computer as my primary LG 34” Ultra Wide-screen was on the second detected HDMI port at first.

Glenn, find out what video output port is the first detected hardware, which one is the second and which one is the third.
Put your primary monitor on the first detected port.
My guess is that if you do that and make sure that in System settings - Display your primary monitor is the left one that your icons will still be there after a reboot.

Glenn, hope this is the missing peace that you where looking for and I would like to thank you for providing me with the missing peace of information that I was looking for.
Because of your added information I now know that it never was an resolution related problem.
To me the problem now seems to have 2 variables:
1) Is the primary monitor the positioned as the left one in System settings - Display
2) Is the primary monitor on the first detected hardware port
   You can see that in in System settings - Display.
   My primary monitor is on HDMI1 and my secondary is on HDMI2.