Just popped over here to raise the same issue. I have posted in the Astrobin forum as older images were not bringing up the plate solving info when hovering over the image. That has now been fixed.
Tried last night to copy/paste urls from Astrobin into SGP and nothing would come back with a success message. Old links nor new links. Again, raised this on the Astrobin forum - It was suggested that that this be raised with the SGP developers.
Its a pretty useful feature and its a real shame that its all stopped working. Just to add, this is on SGP v184.108.40.206. Was thinking about rolling back myself until i saw that had already been tried!