ITunes Artwork Screen Saver Not Working. Empty black screen. Garbage collection, memory leak issue? ... malloc: auto malloc[]: attempted to remove unregistered weak referrer 0x ...

Hey Smart Apples,
My iTunes Artwork screen saver is not working. After reboot, then selecting iTunes Artwork in System Preferences, just a black screen appears in the preview, as well as when pressing Test, and when allowing the screen saver to start on it's own. The error message in Console says...
11-10-13 2:13:18.304 AM [0x0-0x4f04f].com.apple.systempreferences: System Preferences(540,0x7fff77286960) malloc: auto malloc[540]: attempted to remove unregistered weak referrer 0x102021a10
11-10-13 2:13:18.305 AM [0x0-0x4f04f].com.apple.systempreferences: System Preferences(540,0x7fff77286960) malloc: auto malloc[540]: attempted to remove unregistered weak referrer 0x102021a60
also...
11-10-13 3:31:38.722 AM [0x0-0x65065].com.apple.ScreenSaver.Engine: ScreenSaverEngine(727,0x7fff77286960) malloc: auto malloc[727]: attempted to remove unregistered weak referrer 0x109eac410
11-10-13 3:31:38.723 AM [0x0-0x65065].com.apple.ScreenSaver.Engine: ScreenSaverEngine(727,0x7fff77286960) malloc: auto malloc[727]: attempted to remove unregistered weak referrer 0x109eac460
The memory address location at the end of each line is different everytime I preview the screen saver.
I've tried...
    deleting ~/Library/Preferences/ByHost/com.apple.screensaver.* files
    making sure each album has a cover in iTunes
    running Get Album Artwork in iTunes
    recreating symbolic link ~/Music/iTunes/iTunes Music -> ~/Public/iTunes Music/
... but doesn't help.
All other screen savers work... my usual is Flurry, and it works too, but gives invalid framebuffer operation under Console.
Nothing running/checked under Sharing.
Activity Monitor:
0     kernel_task    root    1.5    66    355.9 MB    Intel (64 bit)    124.7 MB
1     launchd    root    0.0    3    1.6 MB    Intel (64 bit)    38.7 MB
41     mds    root    0.0    4    104.4 MB    Intel (64 bit)    260.8 MB
93     WindowServer    _windowserver    9.0    5    81.5 MB    Intel (64 bit)    31.6 MB
26     coreservicesd    root    0.0    4    26.8 MB    Intel (64 bit)    37.3 MB
44     loginwindow    [userhandle]    0.0    2    22.7 MB    Intel (64 bit)    19.2 MB
152     com.apple.dock.extra    [userhandle]    0.0    2    12.0 MB    Intel (64 bit)    32.2 MB
19     opendirectoryd    root    0.0    8    8.3 MB    Intel (64 bit)    25.3 MB
192     applepushserviced    root    0.0    4    7.1 MB    Intel (64 bit)    29.9 MB
11     UserEventAgent    root    0.0    4    6.8 MB    Intel (64 bit)    41.7 MB
23     securityd    root    0.0    4    6.6 MB    Intel (64 bit)    32.9 MB
57     socketfilterfw    root    0.0    3    6.3 MB    Intel (64 bit)    31.7 MB
60     lsd    root    0.0    3    5.9 MB    Intel    32.8 MB
15     fseventsd    root    0.0    29    5.3 MB    Intel (64 bit)    45.9 MB
14     configd    root    0.0    7    5.2 MB    Intel (64 bit)    27.1 MB
144     coreaudiod    _coreaudiod    0.0    3    5.2 MB    Intel (64 bit)    32.6 MB
239     aosnotifyd    root    0.0    2    4.6 MB    Intel (64 bit)    28.2 MB
552     VDCAssistant    root    0.0    4    4.6 MB    Intel (64 bit)    30.2 MB
607     xpchelper    [userhandle]    0.0    2    4.4 MB    Intel (64 bit)    29.6 MB
37     revisiond    root    0.0    4    3.5 MB    Intel (64 bit)    27.9 MB
10     kextd    root    0.0    3    3.5 MB    Intel (64 bit)    15.0 MB
42     mDNSResponder    _mdnsresponder    0.0    3    3.4 MB    Intel (64 bit)    40.9 MB
30     warmd    nobody    0.0    3    3.2 MB    Intel (64 bit)    23.2 MB
71     netbiosd    _netbios    0.0    2    2.9 MB    Intel (64 bit)    40.8 MB
594     cupsd    root    0.0    3    2.9 MB    Intel (64 bit)    41.4 MB
600     taskgated    root    0.0    3    2.7 MB    Intel (64 bit)    28.6 MB
31     usbmuxd    _usbmuxd    0.0    3    2.6 MB    Intel (64 bit)    40.6 MB
591     writeconfig    root    0.0    2    2.5 MB    Intel (64 bit)    29.3 MB
33     special_file_handler    root    0.0    3    2.3 MB    Intel (64 bit)    21.1 MB
28     ntpd    root    0.0    1    2.0 MB    Intel (64 bit)    18.6 MB
204     filecoordinationd    root    0.0    2    1.9 MB    Intel (64 bit)    21.7 MB
20     powerd    root    0.0    3    1.8 MB    Intel (64 bit)    29.6 MB
48     hidd    root    1.0    5    1.8 MB    Intel (64 bit)    22.7 MB
55     autofsd    root    0.0    2    1.7 MB    Intel (64 bit)    21.6 MB
106     logind    root    0.0    2    1.6 MB    Intel (64 bit)    21.1 MB
94     CVMServer    root    0.0    1    1.6 MB    Intel (64 bit)    21.8 MB
17     distnoted    root    0.0    2    1.6 MB    Intel (64 bit)    21.1 MB
13     diskarbitrationd    root    0.0    3    1.6 MB    Intel (64 bit)    21.7 MB
608     activitymonitord    root    2.5    1    1.4 MB    Intel (64 bit)    28.6 MB
109     launchd    [userhandle]    0.0    2    1.3 MB    Intel (64 bit)    38.1 MB
546     Firefox    [userhandle]    1.5    21    389.6 MB    Intel (64 bit)    321.6 MB
551     Firefox Plugin Process (Shockwave Flash)    [userhandle]    0.0    5    22.4 MB    Intel (64 bit)    37.1 MB
540     System Preferences    [userhandle]    2.1    8    82.5 MB    Intel (64 bit)    321.8 MB
143     Finder    [userhandle]    0.2    8    61.8 MB    Intel (64 bit)    171.6 MB
328     mdworker    [userhandle]    0.0    4    48.0 MB    Intel (64 bit)    69.6 MB
140     Dock    [userhandle]    0.0    3    40.6 MB    Intel (64 bit)    35.5 MB
520     Console    [userhandle]    0.0    3    35.2 MB    Intel (64 bit)    41.5 MB
605     Activity Monitor    [userhandle]    12.1    3    23.6 MB    Intel (64 bit)    35.2 MB
142     SystemUIServer    [userhandle]    0.0    2    21.3 MB    Intel (64 bit)    50.5 MB
389     GrowlHelperApp    [userhandle]    0.0    3    18.2 MB    Intel (64 bit)    37.5 MB
207     AppleSpell.service    [userhandle]    0.0    2    13.0 MB    Intel (64 bit)    36.6 MB
155     ubd    [userhandle]    0.0    7    11.2 MB    Intel (64 bit)    26.8 MB
593     Image Capture Extension    [userhandle]    0.0    2    10.8 MB    Intel (64 bit)    33.0 MB
150     fontd    [userhandle]    0.0    2    10.6 MB    Intel (64 bit)    28.4 MB
166     Little Snitch UIAgent    [userhandle]    0.0    3    9.0 MB    Intel    30.8 MB
167     Little Snitch Network Monitor    [userhandle]    2.3    4    8.6 MB    Intel    31.9 MB
131     UserEventAgent    [userhandle]    0.0    3    8.4 MB    Intel (64 bit)    41.3 MB
141     talagent    [userhandle]    0.0    2    7.0 MB    Intel (64 bit)    30.5 MB
160     imagent    [userhandle]    0.0    4    5.4 MB    Intel (64 bit)    15.5 MB
290     iTunes Helper    [userhandle]    0.0    3    3.6 MB    Intel (64 bit)    29.7 MB
115     distnoted    [userhandle]    0.0    4    3.3 MB    Intel (64 bit)    25.3 MB
559     lsboxd    [userhandle]    0.0    2    2.7 MB    Intel (64 bit)    30.8 MB
304     cookied    [userhandle]    0.0    2    1.9 MB    Intel (64 bit)    30.3 MB
165     AirPort Base Station Agent    [userhandle]    0.0    4    1.9 MB    Intel (64 bit)    22.8 MB
154     warmd_agent    [userhandle]    0.0    2    1.7 MB    Intel (64 bit)    22.8 MB
146     pboard    [userhandle]    0.0    1    1.5 MB    Intel (64 bit)    19.7 MB
35     stackshot    root    0.0    3    1.1 MB    Intel (64 bit)    21.6 MB
12     notifyd    root    0.0    3    1.0 MB    Intel (64 bit)    25.3 MB
46     KernelEventAgent    root    0.0    3    988 KB    Intel (64 bit)    29.2 MB
584     launchd    _spotlight    0.0    2    784 KB    Intel (64 bit)    38.1 MB
586     mdworker    _spotlight    0.0    3    5.6 MB    Intel (64 bit)    22.9 MB
587     distnoted    _spotlight    0.0    2    1,008 KB    Intel (64 bit)    30.3 MB
16     syslogd    root    0.0    4    764 KB    Intel (64 bit)    39.2 MB
50     dynamic_pager    root    0.0    1    740 KB    Intel (64 bit)    9.4 MB
173     appleprofilepolicyd    root    0.0    1    724 KB    Intel (64 bit)    9.4 MB
59     memcached    daemon    0.0    6    640 KB    Intel (64 bit)    29.0 MB
Does anyone have a solution?
Environment: Mac OS X (10.7.2), Macbook Pro (late 2008)

So it turned out that the cause of the problem wasn't as complicated as I thought...
I had a few songs that were not added to the iTunes library, instead referenced from other locations on my hard drive.
Specifically, if you bring up the Get Info window of a song, under Summary > Where, it may show a different path than your usual iTunes Media folder location, set under Preferences.
E.g. Where: ~/Desktop/downloaded_song.mp3
I guess, this happens when you drag a song into your iTunes instead of adding it to the library, and apparently, causes problems with the Artwork Screen Saver.
Solution:
To correct it,
For those songs, go to File > Add to Library...
Then find and select the song file.
That's all I had to do to get the screen saver working... All your songs have to be added to your iTunes Library.
I think my brother was messing around with my playlist... I hope Apple nails a better way to lock-unlock/secure OS X soon (proximity sensor, biometric 3D face recognition, unique voice recognition, soul recognition, etc.).
That malloc error message still shows up; that must be an unrelated issue with the screen saver.
I hope this helps out all those suffering through the same issue with their iTunes Artwork Screen Saver.

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ITunes Artwork Screen Saver Not Working. Empty black screen. Garbage collection, memory leak issue? ... malloc: auto malloc[]: attempted to remove unregistered weak referrer 0x ...

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