On the page that first comes up when I start W10, I have icons for most of the software I use. I have attached a screenshot to show what I am talking about.
For Google calendar I use the icon that Google uses for it. Well, Google has a PNG file that I have converted to a ICO file.
Everything is fine for a day or two, and then it goes blank, as shown in the screenshot.
I did exactly the same thing on my laptop and it has never gone away.
Any idea what is causing this and how I can avoid it disappearing?