External monitoring is usually done for critical evaluation purposes. You can't do that with SD on an HDTV. For proper critical viewing of SD media, you need an SD set that can display proper interlacing - that means CRT. So, yes, that means two external sets for two work flows, one for SD and one for HD. There's no other way to do it right.
Time to break out the old Sony and FireWire cable.
Like I stated with my update to the post, the problem is actually occuring because Premiere can't seem to scale the video signal correctly. However, I'm not sure if it's 100% Premiere's fault, or if it has something to do with the 64-bit operating system (never had any issues like this while running any pre-CS5 Premiere on a 32-bit OS).
I'm also wondering if the only way to make my current setup work is to go ahead and buy a supplementary I/O card or device to feed an external monitor; something like an Intensity Pro or Matrox box. I would hope that that device would take over the video scaling/rendering and be able to display a clean signal.
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Premiere Pro is looooong overdue for a proper monitoring solution, one that does not depend on closing or extending desktops, one that does not depend on third party codecs at all, one that works with just about any graphics card that has the appropriate port.
the problem is actually occuring because Premiere can't seem to scale the video signal correctly.
Actually, the problem is occurring because proper monitoring should not include any scaling at all. You can't get a correct SD signal displayed onto an HDTV. There will be scaling and deinterlacing of some sort going on, and you don't want that. You need to use a CRT set (and hence, FireWire out) for correct SD monitoring.
I am fully aware of how to "correctly monitor" an SD signal; that wasn't the issue.
Anyway, I figured out a solution for the problem I was having: enabling GPU accelerated rendering. I had to use the graphic card hack trick because my GTX 465 isn't officially supported, but the SD signal is no longer having issues scaling itself and generally looking strobed/half-field only. The only issue now is viewing the interlaced video on this progressive monitor/TV, but it just looks the same as watching interlaced video on your computer without running it through a media player that auto-deinterlaces. It would be nice if you could tell Premiere to deinterlace it's preview video signal before sending it down the pipe to the monitor, because my Samsung can't compensate for it.