When I attempt to render an animation it is saved as individual images (which I can easily edit together but it’s a bit of an extra faff!) and not a .wmv/.mp4 video as selected. An error warning of “File not found or invalid sequence“ just appears. Can anyone help? 
Molly,
Please make sure you have the latest version of Bongo installed. I think this is an issue that we’ve fixed.
In general we don’t recommend that you create the video file at the same time as you render out the single frames. We recommend that you first render out the frames and then once they’re rendered, use the Video Encoder to make the video.