Transcription not working in upgrade to 19.1.4

I've used Transcription regularly in Studio with no issues. However, I just upgraded from 19 to 19.1.4 and suddenly when I try to transcribe a timeline, I get only the "music" or "silence," none of the dialogue.
Any suggestions on how to fix? Thank you in advance!
I'm running 19.1.4, Build 11, on Apple M3, 24GB RAM, Sonoma 14.5
Any suggestions on how to fix? Thank you in advance!
I'm running 19.1.4, Build 11, on Apple M3, 24GB RAM, Sonoma 14.5