Used to be favorite, no longer works

I loved this app, and used it for almost every Facebook post Ive ever made of more than one picture. Now, I cannot go back after Ive started a collage or goes to a black screen. The only thing I can do is close out the app and restart it, but that is not even remotely functional like it used to be. I truly hope they fix this, I can dont know that I will find another collage app as useful to me.

KellCat about ProCollage - Photo Collage Maker & Photo Stitch Creator