Due to coding error the likelihood values DET_ML and EXT_ML computed by emldetect versions 4.24 and older were overestimated by a factor 2 or more. From version 4.27 on, the correct values are computed. Note that this change strongly reduces the number of spurious detections at a certain likelihood threshold.
With introducing the analytical 2d PSF, parts of the algorithm for fitting the source positions have been changed, increasing the accuracy of image-pixel and sky-coordinate positions. Therefore, source positions determined by emldetect runs with psfmodel=ellbeta and positions determined with psfmodel=medium can differ from version 5.15.4 on.