Has anyone experienced any problems losing their Slate. I came out of the corridors and stepped outside. I approached the new sign and went to the linking bubble however I now seem to have lost my slate. Do I need to go back and go all through the corridors again?

It will reappar in time, did you try quitting and starting again?

I think that the slate may also appear of you go to one of the pedestals and touch the upper part to place it back on the pedestal. Then you can take it again.
Jon