Not sure what happened, but the old transcribe would do a much better job. This one is pretty much useless. I'm not getting options of language or if the dialogue is mixed, so I'm assuming that its recognizing it automatiacally now. The results I've been getting since upgrading are not as good. It used to be pretty on point for me before the upgrade.
Also, it appears to me, without any Adobe corroboration, that the actual language pack files may be updated at any time. And there are multiple files for each language. But the accuracy generally should always be better.
Either of those issues might affect accuracy of transcription.