I contacted Yamaha today, and after being transferred five times (!) I spoke to someone who's meant to be one of the top techinicians or something.

He said I should contact the dealer, and they will send it to Yamaha. He said that he'ld just come from an international Yamaha seminar which included discussion about Tyros, and that he'ld never heard of the USB problem before. Strange. When I mentioned what I'ld seen on the forum he said that you can't always rely on forums (I know - a chutzpa!).

Anyway I'm contacting the dealer tomorrow. We'll see (now I've also got the mic problem which I posted in a new thread).

rgds Zalmi