The names of your "emulators" in Attract-Mode need to match the file names in ./attract/layouts/robospin/clogos/. You also need to go to Configure-->Displays--><choose emulator>-->Layout Options-->Enable Game Marquees and set it to "No".
First of all thank you very much for your help!!
However it doesn't work for me. First of all, I didn't have a directory "clogos" - is that right? I created it, to no avail. Shows a black marquee
Also, I do have two robospin dirs:
./attract/layouts/robospin
./attract/layouts/robospin-betanew
in which one does clogos go?
.jpg file is fine, right? Doesn't have to be .png?
Thanks again!!