I was able to get this to work by making a simplified version of my .star file for import, containing just the micrograph name and X/Y coords. eg:
data_images
loop_
_rlnCoordinateX #1
_rlnCoordinateY #2
_rlnMicrographName #3
Of course this means that you’re losing any shifts and angles for you particles, however.
Other than changing the .star file, I was following the process described here: