Thanks for the suggestion. I had already run MacKeeper, but I did what you said and the Mac HD is OK. I am going to see if I can go back into the Time Machine to a date when I know that the Logitech Media server was working, and see if I can find the files that made it run. I thought that if I restored them individually I might get the computer to revert to its former condition. Does that sound possible? Otherwise, I have some detailed instructions for removing all the Logitech sever related files and re-installing. It is a bit daunting for a non-geek, but I might have a go. Finally, I have instructions to do 'port forwarding' in case that helps. I'd only attempt such things if I had expert help however - which is where you come in.
As you are so brusque with your comments about MacKeeper, I have decided to terminate this. And to sell the Logitech Squeezebox ... Enough time wasted on useless gear and unhelpful 'experts'.
I'll assume you have checked for updates here correct?http://www.mysqueezebox.com/download