[Dariarb]

I have a problem with the Calibre and I don't know how to solve it. Before when I added a book to the Calibre and the book has the cover included, automatically you can see the cover at the right side. (See Image 1). Now I see a brown book. Also, if the book has the cover included, in Edit metadatos section, you can see the cover. Now I see a brown book. (See Image 2) In Add Books section I have marked the option to read the name of the file. How I can resolve that? Thanks in advance.