I found out more about this problem, it seems it has something to do with the library folder and the "watch library for new files" setting.
After I installed my new Jaunty I had rhythmbox open and let it watch ~/Music for new files then I copied all files from my backup in ~/Music, it recognized all, but the time for all MP3s was unkown. This applied for every new MP3 file in ~/Music, also when removing some mp3 files from the folder and the library and moving it back. but i noticed that when I imported Mp3s manually, i.e. with drag and drop from desktop, the playtime was detected correctly. now I created a new Folder ~/Music2 set rhythmbox library to this path and also the watch option. then removed all files from the library (right-click -> remove) and moved the actual files to ~/Music2 - and BINGO. now the playtime of the files is detected correctly .. weird bug. -- Rhythmbox 0.12.0 time unknown, seekbar disabled https://bugs.launchpad.net/bugs/373534 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs