iCloud Photo Stream has stopped working on iPad 2

I have been using photo stream on my iphone, ipad and imac for months now with no issues but I noticed earlier today my iPad will no longer sync and accept new photos from the stream. I did what I thought was best which was to turn it off and turn it back on again, all of my stream photos were deleted as I expected but since it was turned back on it will not download any new photos and this section is blank.

it works perfectly well still on my iPhone and mac. I am using 5.1.1 with no problems until today.