I've got the same problem and apparently the FBV Mk II Express cannot control either the 'Bank' control on the Spider V 60, or the Looper functions, even though the 'Line 6 FBV Control' application hapilly allows you to assign both of these functions to the buttons on the FBV. Why have Line 6 stopped these functions working with the Spider V ?
GAKs only suggestion was to buy the FBV3 pedal which is well over double the price and much larger, both of which I don't want; or to buy a dedicated looper pedal which would mean I lose wireless to the guitar (for me THE main feature) and also need an extra power supply.
The main reason I bought this amp was the wireless guitar connection and the floor based looper so sadly, as I'm loving the sounds, it's all going to be returned.
Also, the amp totally failed 2 days ago and stopped giving any guitar sound :( :(
