Audio CD Burning

I have suddenly had problems when trying to burn audio CDs.

I have been using OSX 10.26 and a external SCSI Yamaha drive,
CRW-8424S-SCSI and Toast 5.2.1. Recently I have upgraded to OSX 10.2.8
and Toast 6 but the prolbem persists.

I normally extract the audio tracks to my HD and then burn from there.
But now when I try to do this Toast gives me the following message:

The drive reported an error:
Sense key=ILLEGAL REQUEST
Sense Code= 0x26, 0x02
PARAMETER VALUE INVALID

Does this mean anything to anyone?

The only other things I have installed recently are Java 1.4.1 Update
and the last 2 Security Updates. Toast will still burn data discs
without a problem and 5.2.1 will burn audio discs in OS 9.2.2

Can anyone help me?

Thanks
Colin.