Since I got started to make my projects encoding to mp4 format (no matter main concept or XDCAM codec used)the process may be hanged up on random stage, and if I try to press "cancel" button nothing is happening - only program interrupting over task manager could help in this case. But some projects, that were hanged up before may be completed successfully occasionally. I have noticed, that this issue may be happened only if I rotate my original medias (image sequences, in most of the cases) by choosing "properties" and changing "rotation" field. In the rest of the cases all projects has rendered without any problems.