okay, so this is because of the prevent cross site tracking feature - can't make website exceptions so its either on or off all the time. Seems to be that the only way to get around it is to implement an export and import save feature.
I am also on Safari and I could not fix the issue in none of my games. Sometimes it works for a couple of days but then either due to the new game release or some internal rules everything is wiped out. I guess it is due to the cross site tracking you mention - that I have not checked
Yeah I think having some kind of export would be cool. Maybe even in a form of a huge encoded string like the old flash games used to do