I have learnt to-day, on the PR Tutorial Forum that some USB hubs misbehave because the power that they draw from your computer is insufficient for some things I have to do. To-day, overover who is a moderator on the PSR Tutorial Forum posted a reply to my question about recording and USB hubs, which went into some detail which helped me enormously. I am now off to buy a 5 volt power supply to plug into my Hub.