On SMOS both versions 1.23 and 1.24 crash on each 4GB card, no matter what value for --4g-alloc-size parameter is set. Version 1.22 works well except 560 cards, there it often goes to 0 hash and the rig freezes. Again, I tried many parameters from 3900 to 4080. Sometimes 560 starts, sometimes not. And after several hours it goes to 0.