As I had problems with my database because of Everest.fr hands that made errors in the "Tournament" section, I exported all my hands using "Database Management".
Then delete database and create a new one.
When trying to import hand history files that had been created previously by HEM, the manual import seems to work fine: no error, and number of hands imported seems correct.
In fact, no hand seems to have been imported. I have no player in my database, can't choose my "hero" name in the hud section, and by browsing tables with PgAdmin, I can see that my database still seems to be completely empty !!!
I have sent your support an email, and a sample of the hand history that have been creating by HEM during my export.
It's working with french rooms, so maybe the problem comes from here