Hi,
This problem was bugging me for a while until I accidentally stumbled on a
fix.
Essentially the problem is when you view a MySite, you don't get a link back to your Portal site. Easy enough to add a link in SharedServices1 > Personalization site links. Except that when you click and return to your Portal, the menu has retained the MySite navigation because the URL contains "?MySiteView=1".
The solution (as per link) is to add a # on the end of the URL you enter, this makes the rest of the link an anchor so SP will ignore it and display your normal menu.
All credit to
AndyPete
Nothing is as it seems, nor is it otherwise.