re-edited ID3 Tags, now library shows only empty fields

I wanted to synchronize ID3 data (after a lot of re-editing, mainly "genre"),
tried it with Media Monkey: I said "synchronize ID3v1 and ID3v2 tags"

I-Tunes shows everything perfectly (but I don't like it)
WMP has no Problems, but does not show the changes I made.
Songbird has a big Problem: the whole library is empty.

Well not really empty: there are hundreds of lines in the view, but all fields are empty.
And I can't delete them.
Everytime I click on them I get error Message (see below).
Re-importing the Music Folder is not working, it does not add anything.
And after 45min of searching here i still don't know how to reset my Songbird library.
(Sometimes I want back the times of Paperback User Manuals!!!)

WinXP SP3
Songbird 1.1.1
Error message:
playlist.xml - onPlaylistClick - [Exception... "Component returned failure code: 0x8000ffff (NS_ERROR_UNEXPECTED) [nsITreeView.getCellProperties]" nsresult: "0x8000ffff (NS_ERROR_UNEXPECTED)" location: "JS frame :: chrome://songbird/content/bindings/playlist.xml :: _onPlaylistClick :: line 1788" data: no]