I did some dig around and found out that the newer WP or this plugin won't handle "post_name" in utf-8 properly which causes this plugin not to work.
For example,
if you post name is in plain English let's say "test 1", in the "post_name" field it will store "test-1"
However, if you post title is not in English, for example in UTF-8 format, in the "post_name" field it will show up something like this
"%e6%84%9b%e5%96%b2%e6%88%91%e7%9a%84%e5%aa%bd-20110808-%e9%98%bf%e9%a3%84%e6%98%9f%e5%85%89%e5%a4%a7%e9%81%93%e4%b9%8b%e6%97%85%e9%81%8a%e6%80%aa%e8%ad%9a-5"
which will cause custom permalink stop working.
I was wondering if the author would fix it.
thanks