Hi juergen,
This bug where you appear to not be logged in when you actually are (on the IceTV home, Download App and Try IceTV pages) was fixed more than a month ago.
For anyone still seeing this bug on the website please clear your web browser's cache.
There are instructions on "How To Clear A Browser Cache" for IE, Mozilla Firefox, Opera, Chrome and Safari here:
http://www.ghacks.net/2011/04/23/how-to-clear-a-browser-cache/Note: I still see this behaviour because I am constantly switching accounts. So if you have 2 or more IceTV accounts you may still see this behaviour when switching between your accounts. If you go back to one of the pages on the TV Guide menu it will show that you are logged in (which you need it to do to get access to the My Account menu).