Essentialy the same problem here.
Upto firmware version 2.70 everything worked perfect.
I can update the Helix to firmware to 2.71 and 2.80. With those versions installed however, HX edit mentions no device connected and the application closes a few seconds after startup.
Helix can be seen as a connected device under Windwos 8 though and audio is transfered under usb as well.
Back to firmware 2.70 (only with the previous updater) HX edit can connect to Helix again.