My problem kind of morphed into something else.
Essentially, I couldn’t get any Proxies to appear when generated from a Meta-strip (which I was certain I had achieved in the past). I had deleted the old Proxies and so I really needed new ones. I could go to the Meta Strip > Strip > Rebuild Proxy and Timecode Indices and it would generate an Image Sequence…but I couldn’t get that to display at all.
So! I eventually “solved” this by
Tab on the Meta-Strip to expose its component parts >
Select the video strip which I want to have a Proxy for >
“N” to go into its Properties >
Check the “Proxy / Timecode” box >
Create or designate the folder you want the Proxy to be placed in >
Tab out of the Meta-strip’s component views and go back to the Meta-Strip >
“N” for the Properties panel >
Check the Meta-strip’s “Proxy / Timecode” box >
In the VSE window’s tabs, go to Strip >
Rebuild Proxy or Timecode Indices
…And it should then generate a new Proxy video (not an Image Sequence) in the folder that you had designated.
I doubt that this will be much assistance to anybody, but man have I had some issues with the VSE in general and the Proxies in particular!
I think it would be good to be able to simply create one’s own Proxy and just have greater control over this. (In fact, now that I look harder at it…it appears that this new Proxy is again out of sync by a few frames.)