Comment 2 for bug 1946342

I need an exception trace. Run calibre in debug mode (click the down arrow on Preferences and choose Restart in debug mode) and post the exception(s) from the log.

FWIW: your #authors_namesinverted column can be better expressed as
  {authors:'list_re_group($, ' & ', '.', '(^.*$)', '[[$:swap_around_comma()]]')'}
or as I would prefer:
  program: list_re_group($authors, ' & ', '.', '(^.*$)', '{$:swap_around_comma()}')

And unless you have a reason to have two columns I would do this to build the inverted comma-separated list directly from the authors column:
program:
 res = '';
 for author in $authors separator ' & ':
  author = swap_around_comma(author);
  if !res then
   res = author
  else
   res = strcat(res, ', ', author)
  fi
 rof

I included the above in the attached txt file in case launchpad breaks the lines in strange ways