I have 20180520 loaded, a colleague has an earlier version (I think 20180129). Our configuration page settings are the same - Mode-CS+filter (Beta on his). On my traffic page I can see him (CSAP) but not myself. On his traffic page he can see me (CS-P) and also himself. Is there a reason for this difference? He has had a occasional "ghost" target (an aircraft symbol on his SkyDemon) very close , 100ft below which turns with him.I assume it is generated somehow from his own transmissions. I have checked that he has the correct (and matching) registration and Hexcode. Thoughts please?