cannot access folder though I have right

Though I am a member of the group "shortfall", and there are group access
rights (rwS) for the folder db/rev/1, I cannot access it. I also have
disabled the SELinux totally to isolate the problem. May anyone tell me why
I cannot access the folder? Followings are the diagnostic info:

[chensy_at_chen working]$ ls -l /home/svn/shortfall/db/revs/
total 8
-rw-rwS--- 1 chensy shortfall 115 Sep 13 13:04 0
-rw-rwS--- 1 root shortfall 2238 Sep 13 13:04 1

[chensy_at_chen working]$ more /home/svn/shortfall/db/revs/1
/home/svn/shortfall/db/revs/1: Permission denied

[chensy_at_chen working]$ whoami
chensy

[chensy_at_chen working]$ getent group shortfall
shortfall:x:525:chensy,lanhai

[chensy_at_chen working]$ su -
Password:
[root_at_chen ~]# sestatus
SELinux status: disabled

-- 
All the best,
Michael Chen