OK - so you have edited some video and created a multicam piece which contains videos from 4 cameras, and after watching the video which is now placed in the timeline you notice, hmm, that error of mine needs to be corrected. So first I go to the project bin and open multicam that way - - no no - - probably says it in the manual - don't make changes that way - they will not post to the timeline multicam clip - OK - so I open multicam from the timeline, and open it in the multicam editor, male the change, then play it again...

 ...whats this - no - now the area edited is frozen when played  - - - OK - - so apparently now I have a new problem - which after making some minor adjustments to where clips in that area and their fades start and stop has no effect....

...so - lets not open the multicam editor, lets just open multicam from the timeline but not go all the way to the editor and make changes (changes that if you open multicam editor would be lost) and of course - now that problem is fixed - but the frozen part of the playback has moved to the left - another problem...

...after 4 attempts  of opening and closing the timeline only multicam work window and adjusting starting points and ending points it likes it and no further problem with that area freezing...

OK - so lets export it - how about a quick 720 mpeg - - woops - - 20 seconds in - - it stops...

...after 4 tries - got it, and the 1080p - - but it crashed when trying to burn a dvd  - - classic