Ok, I solved one question myself, but in turn created another!
I removed one share and then added one that is hosted on the pc that connects to my network wirelessly.
So I am inclined to believe that there is a max number of shares that you can have in WiiMC.
But I discovered that you can use a share hosted from a wireless machine.
Is there a way to increase the number of allowed shares,
And is there a way to arrange the order that they are listed in the menu in WiiMC?