I've logged a support ticket for this, but the helpful response I got was, in summary "Please log a bug, but you won't get a reply".
Basically, my Eng toon can't assign any warp core engineer doffs to active space duty, which I'd really like to do for the power buff when using EPS/EPW. I've tried 3 different ones and it just doesn't work. I've emptied out all my active space doffs so I have 5 free slots and tried again, but nothing. I get the pop up to tell me they'll become bound if I put them on active duty, I click OK and they don't move across.
If anyone has any suggestions I'd be very grateful.