Orange box watercolor

Trying to use The watercolor app (via FX box) the orange box. After masking the image, I clicked on the “paint it” button. After several minutes and multiple layers and actions, the image showed up as a black background.
Before clicking the Paint button, I did highlight the background layer.
Anyone have an Idea what’s going wrong?

I’m having the same issue.
This worked great for about a week and then just stopped.
I’ve tried reinstalling both the app and the fx box to no avail.