When I import an .srt file. I then add as a video track in my sequence to start viewing/editing using Captions Tab - But the edits don't appear in programme viewer i.e. the edit changes.....

Before I can edit the text, I need to shut down PP and reopen it, then the edits are as live. If I try to edit the text, font size etc etc before I've done this, it works in the Captions editor, but doesn't display until I've restarted PP.