Right clicking the Avast taskbar icon results in a menu.
There is nothing special about that - the same applies to every other taskbar icon.
What is different, though, is that unlike all my other icons, the only way to close the Avast menu is to open and close one of the offered services. A small thing, but an irritation.
Is this normal, or do I have a glitch in my installation?
You can click on one of the greyed out areas in the context menu and then click on the task bar afterwards and the menu will close. It’s been like that for me for the last few releases.