Random Duplicated Tracks after update

Everything was perfect, then 2.0 came in . My collection is now filled with duplicated tracks , some are not duplicated but most are. Even with the new tracks i just added, i have a few ! When i export on my usb stick and play on my SC5000 i have no problem and no double. This plus the smaller waveform… not great, will downgrade probably or if someone has a solution?