Thanks. It's a site problem on Steemit apparently. A lot of other people are having the same issue. As you can see by using the links for SteemImg there is no problem there and none of the other major hosts are down either.

Thanks anything we can do to help Steemit grow is good for all of us - you can also download them directly from SteemImg if you want to edit them and dm me if you want big versions for other purposes - most hosting sites have a limit on the size so they are very small compared to the actual originals.