Not sure if it's a bug or a feature, probably the latter. Gridding a track does no more reserve the first hot cue spot (shown in white on the D2s pads) for the grid. Cool! EDIT: Rather a bug. Analysed all files in a new folder and it seems like Traktor did not properly set beatgrids. It showed transients, but no beatgrid was saved. Analysing it again helped, though.