When I look at my payment cards in the LoopWallet app, the title at the top says "View Only" - what does that mean? Can't I pay with them?

A view-only card is either 

a) Stored on a device that is not connected or attached at the moment, like a Fob or a bluetooth accessory that is not connected or paired 

or more commonly

b) a card that was entered manually.

Check out the View Only topic.