One set were MKII's, cant remember what the other ones were. But why would Pioneer put the auto cue button on the MKI if they didn't intend for it to work???
My 900's stop between tracks when Auto Cue is enabled. All CDJ's with Auto Cue should, dont know what is wrong with your gear guys but its not right. Both sets of 800's I have used the Auto Cue feature worked fine.