Dear Sjors, I started and a classification of a dataset. The first 2 iterations worked quite nicely, however in iteration 3 already at the start I get strange outputs: WARNING: Option --dont_combine_weights_via_disc is not a valid argument 7/ 7 sec ............................................................~~(,_,"> 000/??? sec ~~(,_,"> [oo] mymodel.current_size= 48 mymodel.ori_size= 256 part_id= 28416 DIRECT_A2D_ELEM(exp_metadata, my_image_no, METADATA_NORM)= 16.9222 mymodel.avg_norm_correction= 0.720389 exp_wsum_norm_correction[ipart]= 6.00675 old_norm_correction= 4.88227 wsum_model.avg_norm_correction= 26.3485 group_id= 0 mymodel.scale_correction[group_id]= 1 mymodel.sigma2_noise[group_id]= 0.91543 0.6284 0.42518 0.26224 0.21422 0.19368 0.19689 0.17972 this goes on. Morover it wrote debug_class00x.mrc files as well as a debug_model.star file. Do you have any clue what could have gone wrong? cheers David