I tested it and for me its replacing the image.
Do you use a card as an image which was made with my card creator?
If not there could be a bug (which is fixed in my development version but not in the current release) which overwrites the card with a black box.
Thats because there is an algorithm which repaints the cards text area and old cards follow a slightly other color scheme which confuses the algorithm.
Shinjuchi had that bug too and fixed it for the upcoming version.
if that is the case try to make a card with the card creator, they should work and/or be patient for the new version

Hope this helps.