I think that this is an issue of what is displayed in the address bar rather than your named ranges not being set up correctly. If you create a named range on a single sheet then when you click in that cell the name (rather than the cell address) is displayed in the address bar. It seems that this is not the case when the name refers to the same cell on different worksheets.
Just to test this I created a named range 'aname' referring to B1 on Sheet1:Sheet3. On another sheet I entered the formula =SUM(aname) and the correct result was returned.