Can't remove from Main Nav

Hi,
I have marketpress installed on my wordpress MU site. and 'Store' Appears in the main navigation, even if I set the page to draft - is this normal behaviour?
Or is this arising because of a conflict I have created with other functions and plugins?

If it is normal behaviour, do you know how I can stop it? I would like a way of deactivating the store without un activating marketpress.

If not normal behaviour then I'll continue investigating.

Many thanks