Hi
ok, it's not an old version then.
Bit sure where to go from there. I'd suggest reviewing the following:
1 - in the menu table, search for menu item with id 1 and check this is indeed the "Menu_Item_Root"
2 - Double-check your authorization system, ie anything special or custom in terms of authorization levels. Double check the authorization level for sh404SEF as well (by accessing the component directly).
3 - Check that the component id seen in your screen shot (10353) is indeed that of sh404SEF as seen in the "Extensions" list
4 - Check the Extensions list for anything special about sh404SEF.
That's all for now, can't think of anything else right now.
Best regards
Yannick Gaultier
weeblr.com / @weeblr