I updated to PP v15.0 specifically so I could try the captions workflow.
Now I'm done with the captions (for a video 01:38:54 long) but it won't export an SRT file although it will export a TXT file (which have no timecodes). I go through all the usual dialog boxes but the file just isn't there when I'm done.
How specifically are you trying to export? It is working for me. I used the Captions tab in the Export media. You can also export srt from the Text Panel (Captions). Click on the 3 dots -> Export SRT file.
The text file with no timecodes sou8nds like you are exporting a transcript.
Yes, that should work. I'm Windows 10. I wonder if that is an issue. I would file a bug report.
Yes, the File -> Export -> Captions option is gone.
Yes, it should work. I click Save, the dialog box closes (often with the spinning color wheel following) but then I look for the file in the destination folder and there's nothing.
Exporting a text file in the same way works just fine though, so likely a bug.
Moreover, exporting it as a sidecar to a MOV file didn't help either.
I'll keep trying.