DVI-to-VGA adapter disabled on HDMI-equipped monitors?

Can anyone with an Apple DVI-to-VGA adapter on a Core Duo or Core 2 Duo (both at 10.6.8, currently and probably forever) still connect to a second monitor if the monitor also has an HDMI port? I could until early 2011. From 2008 to 2010 I could connect to every VGA monitor through the DVI adapter.
I thought the DVI-out on my MBP died but got a newer MBP and it, too, doesn't work on any HDMI-equipped screens. Both computers and all my DVI-to-VGA adapters work fine on monitors without HDMI. Yes, I rebooted. No, it's not the cables. Again, all components otherwise work in other arrangements. I am not talking about any other setups. The HDMI-equipped monitors all work fine with miniDisplayPort-to-VGA plugs (today!) from newer Macs.
Any work-arounds? Anyone have a best-recommendation on an adapter that works still?

Thanks, BSteely, I have the latest QT and iTunes already. Closing the lid seems to kick the MacBook external display into some special mode that Front Row can't display videos in. For example, you get the Front Row interface, but as you select movies/TV shows, the preview window on the left side is blank. Open the cover, and have both displays going, and you can see the previews fine (and of course, you can see the movies/TV shows play fine as well when you click on them)
Running Quicktime Player full screen works fine without Front Row in either open or closed lid mode. So it is apparently something wrong with Front Row itself.

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