Sorry you're having this issue Bernard.
Can I ask a few questions to try and get to the bottom of this issue?
Can you provide the exact error message you are receiving?
Can you create a new test test scribe with one or two images, create a .Mov file and play back, do you get the same issue?
Is this only effecting .Mov or do you get the issue with FLV files too?
Can you try saving the scribe with a new name, and select the 'Save as a new copy and close' option. When you have does this, open the new copy and retry the render. Do you get the same issue?
It worked fine after I followed your instructions of "Saving As a New Copy & Close".