As any editing process, I fill my tracks, to cross the small videos, to add effects and so on.  After couple hours, it stops doing its job, and every time I playback, there is one video in any track, (never the same necessarely) that become black.  I restart, close the program, close Magix, to eventually be forced to conclude that it's not working anymore.  In the settings, I removed the cookies to ensure that nothing slows it down. 

I am very frustrated with Magix,  since to avoid this problem, I have to restart the project each time or to create a new one.  Except that this is not working anymore.   I have been on the trial for 3 days, without getting anywhere I never got to reach 2 mins of editing without having problems.  

This is very unfortunate, since you are from far my favourite editing program I have worked with, beside this major issue but I can't think of buying in these conditions.