Upgrading Podcastparser helped, but there's still one issue.

[oldpink]

I was able to fix my problems (mostly), by updating to podcastparser 0.6.1, with my podcasts now restoring properly from my list of podcasts saved on gpodder.net, with one exception, a specific podcast that still fails, whether I try using the restored list from gpodder,net, or when I tried to manually add the problem podcast URL into the "Add podcast via URL" option.

http://media.wfyi.org/wfyi/audio/IWIR/IWIR.rss
...which gives me the following text in the popup:
Could not add some podcasts
Some podcasts could not be added to your list:
http://media.wfyi.org/wfyi/audio/IWIR/IWIR.rss: bad request

I can also confirm that reverting to 3.9.1 gives me no such woes, so something about this specific podcast must be choking 3.9.2, but (again) I have no idea what.
Here is the capture of "gpodder --verbose |& tee gpodder-3.9.2_error.txt"

gpodder-3.9.2_error.txt

As an aside, I inserted the "&" to the capture command because it was insufficient to capture only stdout to get tee to save the errors, but I needed instead to capture stderr for that purpose.
Thanks very much for getting me 95% of the way there, really, but there's clearly at least one tiny bug that will force me to stick with the previous version of gPodder for the time being.
I'll help in any way I can still, all the better to see to it that others won't likewise have problems.

[oldpink]

Dunno if you'll see this since you closed it, but applying the patches to the commit you made did indeed get everything working perfectly again.
Thanks, Tom!