there is 2 bugs rendering to mp3 actually. one is when you start render and then just push button to cancel/stop it / wish to keep (no)- a crash detected the other is when you try to write a id3tag title (actually flac and wav also has tags to write name of song etc, so for a whole project this should be usual info) like "Hello i love you  v2.v (reCover won't, you, tell, me, your name)" - it also has an error that sometimes can lead to a crash or just that second err.