I've had a chat with our resident edid guru, and the news is not good. There was a winge that the projector was old, but otherwise the edid looked fine. It is likely that the reason it works when directly attached is that the graphics vendor has added in this mode even though the edid doesn't expressly say it is supported. We do a similar thing in some circumstances, but evidently not in this case.
We used to have a method of adding in additional modes for the display manually, but this is currently broken, so a bug has been raised.
Sadly, there is nothing I can do about the issue now. Look out for maintenence releases, and check back with us on the forum for updates.
Best regards,
Martin
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