I use the FBV Express MKII as a USB foot controller for Logic Pro X. Setup was straight forward and I was really happy with FBV Express MKII. BTW the whole idea of a foot-switch was to speed up workflow,
However, when I came back to my Mac and woke it from sleep all the other devices reconnected, but the FBV Express MKII failed to reconnect. I did a whole bunch of troubleshooting but the end result is the only way to get the FBV Express MKII to reconnect is to manually disconnect and reconnect the USB cable.
I opened a support ticket, the support person implied that the inability to reconnect after sleep was not a bug and Line 6 won't be doing anything to fix it. I have sent a response asking for a clarification.
Given that it is 2014, and the FBV Express MKII is a current product, reconnecting after sleep is expected functionality. I also pointed out that my 14 year old MIDI interface can still reconnect after sleep as can my MIDI controller and audio interface etc.
I will update this thread as I get more information.