Lost Icons & Enhanced view

???
Have read through many messages, and still cannot work out what to do about the disappearing icons on Task Bar. Worked perfectly for years, then disappeared about 3 months ago. Have checked all the obvious things i.e. Task Bar Always on etc. Any help welcome.
Enhanced View, I was always able to access this on past versions, but notice that this time round I must go for the paid version, is this correct or again am I missing something.
Thanks for a fantastic program, must have been using for many years now, as I cannot remember when I first loaded [this could be a Mature Age Moment though]
Thanks again PétaK… [Aust.] 8)

The Enhanced Interface is available for two months (trial period).
Did you buy avast Professional version? If not, most probably your installation downgraded to Home (free) version.
About the icons on system tray, well, can you check: http://forum.avast.com/index.php?topic=25747.msg210596#msg210596