Hi. Thanks both; I am upgrading now but anyways, I have found the bug.
When I do a project with let's say three videos and I reproduce it or convert the files with its original sound, no problem.
When I try to do the aforementioned but silencing each video in order to put some music or whatever, the crash appears.
I am not sure if it is a crash or not because sometimes it seems that reproduces the video but it takes a LOT of time. It is annoying though.
My question now it is, if I convert the videos to a single file, silence it and then add audio and convert again; that will take down the quality of the video? I mean, convert it twice. Thanks and regards.