Dotplot: wrong dotplot

1) Open file human_T1.fa
2) Click "Create dotplot", click "OK"

wrong: dotplot window is empty (no diagonal line, at least)

3) right-click on dotplot, "Dotplot->parameters"
4) click "1k" button, expected state: min length set to 12
5) click "OK"

some dots appeared on dotplot, but still no diagonal line

6) right-click on dotplot, "Dotplot->parameters"
7) set min length to 100 (as it was by default in 2nd step), click "OK"
wrong: dotplot image isn't changed