If from the taskbar open menu of the avast 5 and choose nothing, then you will not close menu of the avast 5 any more. Can you fix it?
Do you mean that when you right click the tray icon and not select anthing then the menu will not disappear?
If so, then it is known about and will be fixed:
http://forum.avast.com/index.php?topic=63621.msg538276#msg538276
Yes, exactly.
Ou, big thx 
Yeah, problem is always there…