Greetings: After taking all the usual backup precautions before the upgrade, I had what I believed to be an extremely good upgrade experience. All apps, data and the desktop came back up perfectly.
However, I now have a situation where I hear a constant “on” alert followed immediately by an “off” alert. I checked notification settings, switched off a couple to no effect. I then thought to check the “Show hidden icons” panel next to the system tray and, sure enough, an icon popped up there when the “on” alert sounded, then disapppeared immediately with the “off” chime.
The action is so fast I had to video it, then take a screen shot to isolate the icon that appeared, so apologies for the quality.
If anyone can ID this icon for me and/or suggest a way to silence it, I would be most appreciative.