An interesting quote from Jason Fitzgerald of Gefen (Product Manager) at
http://forum.gefen.com/topic.asp?TOPIC_ID=5795 about the 15" ADC, maybe if fixing the EDID doesn't work this can be helpful?
Quote:
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There was an issue with the sync polarity with the 15" ADC displays. We tried to recreate your setup here at Gefen and, unfortunately we were unsuccessful in any attempt to get this to work in this combination. Even with the firmware in the VGA-2-ADC where the sync polarity is reversed produced unreliable and unviewable results. While most computers could resolve this issue internally via a direct connect, it seems as though the placing of the USB to VGA device in the chain prevents any type of polarity sync correction to be applied. All firmware on the VGA-2-ADC failed to display an image on the Apple 15" display. Unfortunately there is no fix for this yet.
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