Our customer with Windows region set to Italian (Italy) got this problem when selected *G.Ephem (Graphic Ephemeris) and it is related to difference in American (mm/dd/yyyy) and European (dd/mm/yyyy) date formats.
http://astroelite.com/aelt/pics/ae-t...ty-problem.gif
http://astroelite.com/aelt/pics/ae-t...-problem-2.gif
We were unable to reproduce the problem but it's easy to fix that.
Just input any date that start with January, 1 (01/01) and press Enter.
Then you may input any date you need.