Cacha said:
Score stars don't work for couple of months at Chrome (since 12.0.742.91 up to 13.0.782.218), Win7 x64. Works from IE though.
Make it from 12.0.742.91 to 14.0.835.122

Use the keyboard shortcuts for now
1 star e+1
2 star e+2
3 star e+3 (This adds the image as favorite aswell)