Air 3.4 breaks loading local images (Mac OS X)

Since updating to Air 3.4, my Air app no longer displays local images. Is this a known issue? If so what is the fix?
I'm using the 'mx.image' component to dynamically display an image specified by the user. The image components 'source' property is set to the specified file's 'url' property. Image is displayed as a broken image icon. Was working until the 3.4 update.
Adobe AIR version: 3.4.0.2540.
Mac OS X 10.6.8. On Windows 7 the issue does not occur.
Adobe Flash Builder 4.0.1
Flex SDK 4.1
Thanks for any info!
- Felix

Hi Chris,
thanks for the response. I'm currently making a simplified repro case.
It's hard to debug, since the problem does not occur in Flash Builder debug mode, only when publishing and running with AIR 3.4. Is there a way to make the FB debugger run using AIR 3.4, without updating Flash Builder and the Flex SDK?
- Felix

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===============
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Air 3.4 breaks loading local images (Mac OS X)

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