All of the tracks used in the video are video tracks.
The first track loads as it should in A, the track in B is loaded yet shows no video, the same happens for the third track in A. The track shown first (playing audio and video in A) is now loaded into B where not only does it not show the video it also seems to have no audio... look at the waveforms.
After that, trying to load a track just leaves the spinning icons and that's when I have to quit and re-start the software. It leaves no crash report whatsoever, and I've left it in trying to load for fourteen hours and it won't, it will just sit there.
The only difference between 3.0 and the latest version is that 3.0 will carry on working if I try to load an MP3 track when it's in it's "fault" state, the latest version won't. Hence I'm still using (well trying to use) 3.0.
As you can see the software is completely unusable professionally... how am I supposed to use it if I have to re-start it every few minutes?
http://www.filedropper.com/mov0443