If you have disabled the introduction page, akregator show an empty articles list/browser. This is a poor usability choice as it forces you to select some feed before you can do anything productive. It would be better if the last seen feed/article would be selected at start-up and fall back to "All Feeds" (the root element) if no such last selection information is available.
Thank you for the bug report. As this report hasn't seen any changes in 5 years or more, we ask if you can please confirm that the issue still persists. If this bug is no longer persisting or relevant please change the status to resolved.