Yes, I know that (I've been using Newsbin for many years and love it). The progress bar appears and then disappears, appears and then disappears... and so on. Sometimes it is quick sometimes it is slow. I can never tell when it is not going to reappear.
1 - You have to have headers on disk to show
2 - The headers can't be filtered out because of some filter you've set
If you see the progress bar and it's progressng and then stop but see not headers then the most likely cause is that your headers are filter.
1 - "Hide Old"
2 - "Storage Age" (some people set it short enough so newly dowloaded headers are already purged.
3 - Poster Lockouts.
4 - New headers have stopped importing - Check the "Cache" line and see of there's a number in parens. If there is, that represents header chunks to import into the header database.
You could try clicking the filter button which ios th