Hi cscooper2013
Thanks for the response
I was trying to copy and paste a set of clips and titles - when the error occurs.
Having identified the issue surrounds only 5 clips that are essential to every talking head being produced from the timeline I worked out that the easiest answer was to duplicate the sequence and move the fresh heads into the grouping of video clips - this way avoided copying and pasting the materials causing the crash.
It's a really simple work around - but the crashes and finding out a way around it caused me 45 minutes of grief.
I don't know whether it's a faulty file or not as all the parts play properly, all the audio performs as it should, nothing is clipping and nothing is skipping.
I just don't know why its all of a sudden started happening.