Everything looks fine on the timeline but when I press ctl return to play it I just get a blank page.
Any ideas greatefully recieved! All other files play fine.....
In cases of 'one file behaves strangely' it must be something with the file.
Therefore you either share this file so that someone willing might have a look and give you suggestions or you battle alone.
How do you expect ideas in principle when the question is about a specific file?