Trying to share a folder between windows machine and VM

I was following the guide I found here for doing this and I reached the step where I added myself to the vboxsf group but I am still getting a permissions denied message when I try to get into the folder:

ubuntu12@ubuntu12-VirtualBox: /media$ cd sf_Shared_files/
bash: cd: sf_Shared_files/: Permission denied

I checked to make sure I was part of the group:

ubuntu12@ubuntu12-VirtualBox: /media$ id ubuntu12
uid=1000(ubuntu12) gid=1000(ubuntu12) groups=1000(ubuntu12), 4(adm), 24(cdrom), 27(
sudo), 30(dip), 46(plugdev), 109(lpadmin), 124(sambashare), 999(vboxsf)
 

I am not sure what the problem is, any ideas?

EDIT: Permissions on the folder seem fine:

ubuntu12@ubuntu12-VirtualBox: /media$ sudo ls -la sf_Shared_files/
total 8
drwxr-x--- 2 root root 4096 Apr   4 14:35 .
drwxr-xr-x 4 root root 4096 Apr   4 14:43
 

Wait... for some reason the permissions are funky here cause if I back out one directory and check the media directory:

ubuntu12@ubuntu12-VirtualBox: /media$ sudo ls -la /media
total 15
drwxr-xr-x 4 root root 4096 Apr 4 14:43 .
drwxr-xr-x 24 root root 4096 Apr 4 12:10 ..
drwxr-x--- 2 root root 4096 Apr 4 14:35 sf_Shared_files
dr-xr-xr-x 5 ubuntu12 ubuntu12 2408 Jan 25 11:43 Vbox_GAs_6.0.4

so maybe the permissions aren't correct? Shuld that say ubuntu12 for sf_Shared_files?

--- Post updated at 09:11 PM ---

Ah crap I figured it out. There was a check-box called: Make Permanent which I did not check when I was setting up the folder.