The problem started when I wanted to replace this picture with a version of it without transparency (so it would have an embedded black background). Whatever PNG I uploaded was still converted to transparent. Why, why, why...?
Then I tried to revert to the original version of the pic, but getting this error:
I the tried to upload a new picture, but the same error happens when I try to use it. Is there anything wrong with what I am uploading...?
Thanks in advance