[Todd Perchert]

AE does have a Detail-Preserving Upscale that you could try, but I doubt it will help much. Just not enough information in a postage stamp size file.
TC

[Todd Perchert]

Like Dave said, no. Although, if you have a magic mouse or track pad, you can swipe L/R to scroll as well. I use that sometimes rather than jkl for quick scrolling.
TC

[Todd Perchert]

Easy method is to right-click on your clip (or select multiple clips and right-click) in your Bin. Select Modify Audio Channels. Switch Clip Channel Format from Stereo to Mono and turn off the checkbox for the audio channel you do not want. Hit Okay.
TC

[Todd Perchert]

And if PPro decides to choke on it, send it to AE. I’ve def had better luck with AE for these things.
TC

[Todd Perchert]

It is best to work at half scale or so and let the system scale it up. I don’t know why no one thinks QT can handle odd aspects and frame sizes… I’ve done it for custom walls before – not quite with that size. A QT using PNG is a good codec to render to, then transcode to h264 mp4 using AME – and it will work with that resolution, test it out first. AE can handle going straight to the custom h264 better than PPro can.
But, yes, check to find out if the system it is being played back on really uses that image size.
Good Luck!
TC

[Todd Perchert]

Export to QT then transcode to an mp4. I had to do that until I figured out a more direct route using AE.
TC

[Todd Perchert]

Yes. That is why I suggested what I suggested. When PPro is doing weird things that make no sense and you’ve quit, shutdown, everything basic, sometimes the prefs just have to go. Especially since you said it started after the latest update.
Look here:
https://forums.adobe.com/thread/2126506

[Todd Perchert]

I would say trash preferences and try setting your custom keyboard shortcuts again. Sounds like prefs may have gotten messed up with the new update.
TC

[Todd Perchert]

I didn’t do the latest update… did the shortcuts change? Plus (+) and Minus (-) zoom in and out. CMD + and CMD – changed the track heights. I’m pretty sure I’m using the standard PPro keyboard shortcuts.
That would be strange to change those…
TC

[Todd Perchert]

Certainly sounds like the RotoBrush in AE will be your friend. Use that to mask the interviewee and mask/clone the background section behind him.
Would help to see the shot in question.
TC