I think this is a problem derivated of the change of directory for stories in other languages installations.
Twine 2 fails to preserve any story, imported or newly created.
If I change the directory to Historias so it runs past the blank screen, the tool keeps failing to keep stories and when looking for my stories in the directory structure I found this:
Historias/ with the stories inside. Stories/ empty.
My system is: Win10 x64