Thanks for your answer.
I tried what you said and it didn't work... until I tried "automatic transition" set to one second and then followed with "semiautomatic transition". Then it seems to work, with some bugs, given that some graphics disappear at times, and not consistently every time I play the show
The inconsistancy of whether images show, along with the doulble-movement to get this to work seems a little unscientific... is there something I am missing? The presentations I am making is pretty vital, as we are marketing our school where I teach children mainly using Linux.