For the past two months, my photos have been rejected by Shutterstock for problems  of modele release for the different series offered . I checked them over and over again. I know they are perfectly filled and until now I had no problem..... I use the shutterstock version for all agencies and my photos are accepted everywhere without any problem. Does anyone know what's going on?

Yes that seems to happen to loads of us!  typical amateur behaviour. They expect you to go and chase people up years later for new MR's!!  plonkers!