mount - Trouble Accessing Mac OS X Partition from Ubuntu 14.04

I have a 1 TB hard drive in a Macbook Pro 6,2 (mid-2010) partitioned with 900 GB for Mac OS X and 100 GB for Ubuntu 14.04. I would like to be able to read the files off the HFS+ partition with OS X installed to listen to my music, watch video files, etc.

I changed my Ubuntu account's UID by logging into a second account I created with sudo privileges and running the following (where username is my login username):

sudo usermod -u 501 -g 20 username
sudo chown -R username: /home/username

When I logged back in, I still got the "You do not have the permissions necessary to view the contents of 'Macintosh HD'." In my troubleshooting efforts, I changed my primary account's UID and GID back to 1000 and made a new user account on which I changed the UID and GID. This account now has read access of the HFS+ volume - but when I deleted it and did the exact same thing for my primary account, I got the same error.

Is it possible to change the UID and GID of my primary account to give me access to read the HFS+ volume?

EDIT: Here's a screenshot of the issue when I try to access Documents. The same error occurs for Desktop, Downloads, Dropbox, Google Drive, Library, Movies, Music, and Pictures - but not any of the other (visible) folders. Haven't tried to get into /.wine or anything.

EDIT: Per Thomas W.'s suggestion, I ran sudo ls -al folder, where folder is the folder in which Documents is placed. This is the output:

bzodonnell@bzodonnell-MacBookPro:~$ sudo ls -al /media/bzodonnell/MacOS/Users/bzodonnell
total 232
drwxr-xr-x 1  501 dialout     61 May  4 15:57 .
drwxr-xr-x 1 root      80      5 Oct 20  2014 ..
drwxr-xr-x 1  501 dialout     20 Apr  7 13:11 adarkroom
drwxr-xr-x 1  501 dialout     15 Mar  5 09:27 .android
drwxr-xr-x 1  501 dialout      7 Mar  9 18:44 AndroidStudioProjects
-rw-r--r-- 1  501 dialout    638 Feb 17  2014 .anyconnect
drwxr-xr-x 1  501 dialout     90 May  5 11:48 Applications

-rw------- 1  501 dialout  18776 May  5 16:56 .bash_history
-rw-r--r-- 1  501 dialout    334 Oct 29  2014 .bash_profile
-rw-r--r-- 1  501 dialout    167 Jul 10  2014 .bash_profile.pysave
drwxr-xr-x 1  501 dialout      7 Apr 30 13:11 .cache
drwxr-xr-x 1  501 dialout    156 May  2 13:13 Calibre Library
-r-------- 1  501 dialout      7 Apr  4 11:10 .CFUserTextEncoding
drwxr-xr-x 1  501 dialout      4 Mar  6  2014    .com.stirfirestudios.freedomfall.macos
drwxr-xr-x 1  501 dialout      7 Apr 19 14:17 .config
drwx------ 1  501 dialout      3 Sep  8  2010 .cups
drwxr-x--- 1  501 dialout      6 Apr 15 15:12 .denemo-1.2.2

drwx------ 1  501 dialout     14 May  6 17:04 Desktop
drwx------ 1  501 dialout     19 May  5 11:09 Documents
drwx------ 1  501 dialout    207 May  5 15:13 Downloads
drwx------ 1  501 dialout     12 May  7 08:16 .dropbox
drwx------ 1  501 dialout     73 May  7 09:23 Dropbox
-rw-r--r-- 1  501 dialout  22532 May  5 15:17 .DS_Store
drwx------ 1  501 dialout      3 Apr 14 18:01 .emacs.d
drwxr-xr-x 1  501 dialout     45 Apr 15 14:46 .fontconfig
drwxr-xr-x 1  501 dialout     10 Apr 27 19:25 .git
-rw-r--r-- 1  501 dialout    151 Apr  7 13:24 .gitconfig

drwx------ 1  501 dialout      2 Apr 15 14:44 .gnome2
drwx------ 1  501 dialout     43 Jun 18  2014 Google Drive
drwxr-xr-x 1  501 dialout      4 Feb 26 10:59 .gradle
drwxr-xr-x 1  501 dialout      4 Oct 29  2014 .idlerc
drwxr-xr-x 1  501 dialout      8 Apr 15 14:44 .inkscape-etc
-rw------- 1  501 dialout     35 May  3 17:02 .lesshst
drwx------ 1  501 dialout     71 Apr  4 11:10 Library
drwxr-xr-x 1  501 dialout      9 Apr 15 15:12 .lilypond-fonts.cache-2
drwxr-xr-x 1  501 dialout      3 Feb  9 11:18 .local
drwx------ 1  501 dialout      8 May  2  2011 Movies

drwx------ 1  501 dialout      9 Feb 20 10:33 Music
drwxrwxrwx 1  501 dialout      3 Jul  2  2014 .nchsoftware
drwxr-xr-x 1  501 dialout      9 Apr 30 14:09 PCSX2
drwxr-xr-x 1  501 dialout     11 Apr  6 10:18 .pia_manager
-rw-r--r-- 1  501 dialout 130030 May  7 09:54 .pia_manager_crash.log
drwx------ 1  501 dialout     11 Apr 16 07:10 Pictures
drwxr-xr-x 1  501 dialout      6 Jul 10  2013 Public
drwxr-xr-x 1  501 dialout      6 Apr 15 23:39 .qgis2
drwxr-xr-x 1  501 dialout      3 Feb 20  2014 .R
-rw-r--r-- 1  501 dialout    225 Dec  3  2013 .Rapp.history

-rw-r--r-- 1  501 dialout  16419 Feb  9 14:02 .Rhistory
-rw------- 1  501 dialout   1024 May  3 17:25 .rnd
drwxr-xr-x 1  501 dialout     16 Feb 19 17:24 .rstudio-desktop
drwxr-xr-x 1  501 dialout      6 Jul  3  2014 Sites
drwxr-xr-x 1  501 dialout      8 Apr 15 13:45 stencylworks
-rw-r--r-- 1  501 dialout    123 Apr 15 13:52 StencylWorks.prefs
drwxr-xr-x 1  501 dialout      6 Jun  1  2012 .subversion
drwxr-xr-x 1  501 dialout      4 Apr 14 22:31 .thumbnails
drwx------ 1  501 dialout     25 May  6 16:59 .Trash
-rw------- 1  501 dialout    849 Apr 14 18:00 .viminfo

drwxr-xr-x 1  501 dialout      8 May  4 15:59 .wine
drwxr-xr-x 1  501 dialout     10 May  3 19:51 .wine-brothers
drwxr-xr-x 1  501 dialout      9 May  1 09:25 .wine-steam
-rw------- 1  501 dialout      0 Apr 20 18:17 .Xauthority

EDIT: Here's what I'm typing to make sure the directory is mounted properly. I typed this before I ran the above code.

bzodonnell@bzodonnell-MacBookPro:~$ sudo umount /dev/sda2
bzodonnell@bzodonnell-MacBookPro:~$ id

uid=1000(bzodonnell) gid=1000(bzodonnell) groups=1000(bzodonnell),4(adm),24(cdrom),27(sudo),30(dip),46(plugdev),108(lpadmin),124(sambashare)
bzodonnell@bzodonnell-MacBookPro:~$ sudo mount -t hfsplus -o uid=1000,gid=1000 /dev/sda2 /media/bzodonnell/MacOS
mount: warning: /media/bzodonnell/MacOS seems to be mounted read-only.