Hi there!
It's just like munichorn already wrote, when I click on the "Export PNG" Button, everything looks fine, but as soon as I click on "Portrait", Full Body" or something else from within the CONFIG PRESET section, the character disappears. Also it seems, as if Custom Presets are not saved properly.
There is a big bug in there, maybe you should try to reproduce it on an isolated, fresh system. Since we both have this issue, I am sure there are more people with this problem. Of course I can send you a video, but how?
Best regards and thanks for the quick reply!