I believe this and the other recent bug about LOR export not getting the RGB stuff is related to a change Sean did a while ago that renamed the channels as displayed on the Test tab. They used to end in -R or -B or -G for the red/blue/green channels and the exports were written to expect that. With the change, that's no longer the case and the exports are all now broken.
Not sure if I'll get time to look at that over the next week or so.