[Bas Emmen]

About the crashes

Do you import H264 files? ( MOV – MP4 )
this is caused bij quicktimeplayer. Vegas depends on it
Since quicktime is upgraded Vegas crashes when importing more then about 2GB of files at once.
There are different threads about this:
https://www.slashcam.com/EN/info/-Sony-Vegas-Pro–New-Quicktime-update-destroyed-MOV-support–413985.html

solution is to un-install quicktime and install a old version. (7.5.x)
Goto apple old versions
https://support.apple.com/downloads/#quicktime

Do you use itunes? Watch out. Itunes depends on the latest quicktime and will update the old one again!