I have never encountered this problem with MC18. If I have MC19 open for maybe 10-15 minutes (sometimes longer), and stop a song, and then try to play another, MC19 will freeze and have to be terminated from the Task Manager, otherwise it will persist in the background and make me unable to open it up again.
Sometimes this happens without stopping - even just opening another song can set it off. All files work perfectly with MC18. Sometimes, if I leave MC18 open for an extended period of time, it will take a while to load the first song up (indicated by 'buffering'), and then start playing. MC19 however says 'Opening' and never moves past that - it stops responding around 1 second later.
I realise that I haven't given any technical information, only the steps taken which cause the problem. MC19 is updated to the latest version available on the forum.
Any help would be appreciated.