User-Agent:       Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.6) Gecko/20061201 Firefox/2.0.0.6 (Ubuntu-feisty)
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It does not seem to be possible to load metadata into the playlist at startup? In Options, Preferences there is an option to load metadata "on scroll", "on play" or "never". None of these would give me what I'd consider expected behaviour if you say open an mp3 album playlist by double clicking it from Thunar.

If you add the m3u using the plus-button at the bottom of the playlist interface metadata is correctly loaded.

Reproducible: Always

Steps to Reproduce:
1. Open a playlist of correctly tagged mp3s by clicking on it from Thunar
2. Make the playlist window visible
3. Metadata is not loaded

Actual Results:  
Playlist is opened correctly but metadata is not loaded.

Expected Results:  
The metadata for the entries of the playlist that are visible should be loaded, if the preference is set to "on scroll". The "on scroll" option should maybe be renamed to reflect that the metadata loading will happen for the elements that are currently visible.