Hi Rich 46
Checked all of your suggestions, and everything was set right.
For the past two days, the icons have stayed put.
No idea what, if anything, has changed or is diffewrent.
Have a "feeling" that it might be related to when one switches between the Users on this PC, me and my son, but not sure of this.
Has been well behaved for a while, but sure did drive my crazy, as it did the disappearing act constantly.
Will keep you advised if it goes back to its old ways.
Thanks as always, for help,