Version:           2.1.1 (using KDE 4.2.4)
OS:                Linux

Two serious problems with Amarok 2 collection management:

1) Sometimes, some albums do not appear in the collection, even though they were shown after an earlier update or after adding an album. For example, for artist X only 3 out of 5 albums will be shown, while for most other artists everything is available.

2) Rescanning the collection (typically as an attempt to fix #1) sometimes corrupts entries.

Current example: The album "Pocahontas" by Alan Menken shows up as "Kill Bill Vol. 2" and with the corresponding cover. All tracks in this album are filed under this album and also displayed this way in the playlist. Likewise, the album "Façade Suites I & II, Viola Concerto, Variations on a Theme by Hindemith" by William Walton also shows up as "Kill Bill Vol. 2" with the same cover. Before the latest re-scan, both albums (the Menken and the Walton) showed up as "Façade Suites I & II, Viola Concerto, Variations on a Theme by Hindemith" with the "Kill Bill Vol. 2" cover, but would not open and display no tracks.

The tags in the actual files (FLAC files) are correct, but even adding the files by dragging them from Konqueror into the playlist will display the incorrect tags in Amarok.

I do not know how to fix the collection once it's been corrupted. Re-scans will usually do nothing to correct the broken albums. So far, my solution was to switch back to Amarok 1.4, and with the next update in the 2.x series, things worked fine for a while (a few days typically). However, due to various library updates, Ubuntu's inofficial Amarok 1.4 packages are getting buggier by the week, to the point where most scripts don't work and playback often skips parts of tracks. So now I'm stuck with Amarok 2.1.1 and a broken collection.