Seafile 6.3.4 web UI not load after login

I have just:
upgraded Seafile to 6.3.4
changed Nginx to WSGI
./ python-env seahub/ migrate_file_comment
and all work after start.

The iOS apps works ok (browse & get files from libraries)
The MacOS app is “Initialize” several libraries and can’t upload files.

But the Web UI ask for login and then never end the loading of user dashboard (I have tested with couple of users)

I have performed the following tasks
seaf_fsck -> seaf-fsck run done
rm -Rf /tmp/seahub_cache
and after start seahub&seafile I have not change: the Web UI never loads, just the little circle running is there.

Have you any suggestion?

Rodolfo Pilas