Hopefully the issue with the last letter being chopped off should be fixed.
As for the emails not being sent, I've just tested the latest version on all versions again and I had no problems.
Please check if you have any other plugins enabled that alter the registration process in any way, and that if you are registering users via wp-admin/user-new.php that "Send this password to the new user by email." is checked.
Some installs seem to have issues with the mail being sent regardless of my plugin, a quick search in these forums will come up with a lot of results for that, some of which have some solutions, such as using an SMTP mail plugin.