Movies play audio-only with no picture

I've been having a weird bug with iTunes lately (I'm using iTunes 10.7 in Lion). Sometimes when I play a movie, I hear the audio but there is no picture, not even a black box. It's as if the movie is completey invisible. If I use the drop-down menu to try and watch in "full screen mode" the screen fills up with that gray fabric background that Apple has but still no picture on top of it. If I quit iTunes and then re-open it, then the movie suddenly plays fine. So it's not a serious problem but is very annoying.
I have two monitors on my computer - maybe that is somehow messing things up? Also, it doesn't happen all the time but it happens frequently. I can't seem to figure out any pattern or "trigger" that could be causing it to do this. All my iTunes content is stored on an external USB drive that is getting prettty full but I doubt that's the problem - although you never know so I thought I'd mention it.
Anyone else have this problem? Is there a solution?

Try to disable the hardware acceleration in the Flash Player.
See:
* https://support.mozilla.com/kb/Cannot+view+full+screen+Flash+videos
* http://www.youtube.com/swf_test.html (right-click the player: Settings)
Flash "Display settings" window:
* http://www.macromedia.com/support/documentation/en/flashplayer/help/help01.html

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To disable hardware acceleration in Flash Player:
#Go to this [http://helpx.adobe.com/flash-player/kb/video-playback-issues.html#main_Solve_video_playback_issues Adobe Flash Player Help page].
#Right-click on the Flash Player logo on that page.
#Click on '''Settings''' in the context menu. The Adobe Flash Player Settings screen will open.
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Does this solve the problem? Let us know.

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Last edited by WonderWoofy (2013-08-24 18:45:56)

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at com.sun.media.PlaybackEngine.doPrefetch(PlaybackEngine.java:658)
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!!!!!!!§§§§§§§§§§§ BasicTrackControl:prefetchTrack():96
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Unable to handle format: LINEAR, 16000.0 Hz, 16-bit, Mono, LittleEndian, Signed, 32000.0 frame rate, FrameSize=16 bits
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Error: Unable to prefetch com.sun.media.PlaybackEngine@26e431

Movies play audio-only with no picture

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