I have the same problem with an iBook G4 running OS 10.3.8. The drive will read CDs and DVDs just fine, but I can't burn to CD-R using the native OS X burn feature, iTunes 6.0.4, nor Roxio Toast Titanium 6. I also tried Patchburn, and that didn't help at all. It merely came up with different error messages (i.e. in iTunes: "writing speed is to fast for drive" and it was set to 4x). I have sent an email to Panasonic (panasonic@bigbytecorp.com). I suggest you do the same. Maybe if enough people complain about this drive, they will come out with a patch faster.