Cannot view recipe files

I've been using BeerSmith 2 without trouble for over year.  On opening it today, I cannot view the list of recipe files in the main window.  The file directories and number of recipes are still listed in the "My Recipes" window, but when I click on a directory the main window (with the name of the directory I clicked on) remains blank.  Any idea what's gone wrong?  I've tried restarting the program, with the same problem.

Seem to have fixed this by renaming my BeerSmith folder, then opening program again and importing files.