Hi David,
Many thanks! I will try that now, although, the first time it did this I had not yet installed magic bullet. ( I only put that on yesterday and the second error happened a few hours after)
It’s only done this twice, and there’s been a lot of rendering done between each problem – but it made no sense that I was being prompted to dump files from the render manager when I’ve still got a lot of free disc space.
Many thanks with all your help David!