Bingo! I got it.
I had wondered if the igniter electrode may have been too far from the burner to arc, but I felt that if it used to work, it should still be okay. I removed the electrode, cleaned it up a little, and reinstalled it slightly closer to the burner. Low and behold, after bleeding the line for 90 seconds, it lit right up without any of the shields that would have concentrated the propane around the burner.
I'm not sure if it was just some corrosion around the electrode, or if it simply required readjustment, or both. But it's working now.
I see that the flame is blue within 1/8" of the burner, but then is more orange. Should the entire flame be blue?
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