I have had crashes but to be honest, and having looked at what works and what crashes, it seem to my own fault!
These are my general rules to successful operation of PD6 build 17xx (whatever it was)
Rule 1 for not crashing:- If it's in the time line or the media library then DO NOT rename or move or alter in any way the original file.
Rule 2 : Save the project every so often using sequential file names (Video 01.pds, Video 02.pds ...)
Rule 3 : Add subtitles, titles, transitions etc after composing the main timeline, and save after each one.
Rule 4 : If a .pds file will not load without errors go back to a previous one. I have only ever had problems with reloading due to me ignoring rule 1.
Rule 5 : Try to quit any backgrond programs. Turn off / unplug the internet access and shutdown your anti virus / firewall.
Rule 6 : Give PD6 time to "settle" after opening a project, ensure that all disk activity has finished.
Rule 7 : Turn off the "display sound waveform" option - cannot remember exactly what it's called, but it shows a video soundtrack as a straight line (volume level?) and not as a waveform)
Rule 8 : Keep at it.
Kintara
Human beings, who are almost unique in having the ability to learn from the experience of others, are also remarkable for their apparent disinclination to do so.