Version:           1.4-SVN (23-8-2006) (using KDE KDE 3.5.3)
Installed from:    Debian testing/unstable Packages
Compiler:          gcc-4.0 
OS:                Linux

When I do Tools > Rescan collection, I get the following errors:

amarok: [CollectionDB] [ERROR!] [virtual QStringList SqliteConnection::query(const QString&)]  sqlite3_compile error:
amarok: [CollectionDB] [ERROR!] no such column: false
amarok: [CollectionDB] [ERROR!] on query: SELECT DISTINCT artist.name,LOWER( artist.name) as __discard  FROM tags LEFT JOIN artist ON artist.id=tags.artist  WHERE true AND tags.sampler = false  AND tags.deviceid IN (1,2,-1) ORDER BY LOWER( artist.name ) ;
amarok: [CollectionDB] [ERROR!] [virtual QStringList SqliteConnection::query(const QString&)]  sqlite3_compile error:
amarok: [CollectionDB] [ERROR!] no such column: true
amarok: [CollectionDB] [ERROR!] on query: SELECT DISTINCT artist.name FROM tags LEFT JOIN artist ON artist.id=tags.artist  WHERE true AND tags.sampler = true  AND tags.deviceid IN (1,2,-1) LIMIT 1 OFFSET 0 ;

I use PostgreSQL 7.4 as the database backend. I have no directories selected as my collection. After I selected some directories, it worked as it should.