Q: I tried to open a photo stream on my mac that my daughter sent me. It says open or ignore, I click on open and it says that there is a problem to try again later. It opens just fine on my IPAD.

I upgraded to mountain lion on my Mac mini then I tried to open a photo stream from my daughter. It tries then says there is a problem and to try again later. I have Been trying for the past two days and get the same reply. It opens in my IPAD so why won't it open on the mini Mac ?