Upon using the convert unix to samba users script there is an error in a cgi file under the webmin..../samba directory. The file make_epass.cgi has an error at line 32 html is misspelled as hmtml change this to html and it works just fine.
Logged In: YES
This is a known bug in 0.93 - you can get an update
that fixes it from http://www.webmin.com/updates.html