Things that I'm finding "interesting":
- The thumbnails toolbar is cut in the middle.
- Only one row of thumbs is fully displayed.
- The program crashes before it loads any image.
- You are in "Miniaturas + etiquetas" mode

Try to have at least two rows of thumbs displayed. (make the thumbs smaller, change the View mode from "+ etiquetas" to "+ filename" to reduce the height etc.)
What is happening?