Background Music Problem - "Not Authorized on this computer"

I m stuck in a loop and hope that somebody here has an idea how to help. I just bought a new iMac and transferred my music library over from my old computer using the migration assistant. I authorized the new computer in iTunes and all the music plays without a problem. However, when I try to add music from my iTunes library as a background track over video, I get an error message saying that I am not authorized to play the music. It then directs me to iTunes to authorize the computer but that tells me that I AM authorized.
So far, I have spoken with the iTunes department who tell me it is a problem on the iMovie side and the iMovie folks who direct me back to the iTunes department. If anyone has any idea how to solve this problem, I would greatly appreciate it. I'm running the latest version of both apps.
Thanks

Hi
My list on this - may be of help.
*No Audio*
Most common origin is use of audio from iTunes.
Work around -
• Select needed audio to one new playlist
• Copy out this as an Audio-CD .aiff (not .mp3)
• Use this in the movieproject
Other origins are
1. strange/ailient file formats as -
• .mp3, .avi, .wmv etc
• Convert them into .aiff 48kHz 16-bit and use this
2. the Mac is set wrongly in regard of midi -
• Close iMovie and other programs
• Start GarageBand
• Make a new GB-project and play some notes
• Close GB and Save
• Now try iMovie again
3. No audio when playback in iMovie 1 to HD 6.
a. in iMovie pref - deselect ”Playback via Camera”
b. in System preferences - see that Audio out is not set to zero. Mine often does this
without me knowing why.
Stuttering audio and video
1. FileVault is ON - Turn it off
2. More than 50 audio files in a movie-project
Mix down to one audio clip
3. Project is stored on one (USB) external hard disk - should be a FireWire one
4. the External hard disk is not Mac OS Extended formatted - but
UNIX/DOS/FAT32/Mac OS Exchange and this will not work for Video.
5. To little free space on internal boot hard disk.
I go for a minimum of 25Gb free space when project is imported and edited and this goes for
4x3 SD Video. For 16x9 HD my guess would be about 5 times more at least.
Neither Mac OS, iMovie or iDVD can address any other hard disk than the boot drive for it’s
scratch files. (Unlike Final Cut Express/Pro where You select scratch disk/s)
6. Network storage - DOESN’T WORK
Yours Bengt W

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