Hi,

(at least for me) the attached patch finally fixes the pinentry-ncurses
problems we were still having (as soon as you press a key, the screen is
garbage).

To quote the commit message:

  Previously, when using threads, Ncurses.getch was called while
  the gpg pinentry was running (as an example of using the shell_out
  method). Now, the Ncurses mutex will be used to wait until shell_out
  mode is finished.

Please have a look if this patch is working for you and merge it for the next
release.

Best regards,
Michael