IIRC, I saw the issue come in at about 6.6.0.1, and it's gotten more or less intermittent as new versions come out. You think it's fixed by a new release, and then it comes back. Basically anything written as DAO will give a verification error, while TAO is fine.
It's weird though as when using 6.6.0.6, as I had one image that burned six discs (three manufacturers) in a row that all came up with this spurious error and all were fine when reading back. One smaller image burned fine second time around, and a third, larger image burned with no errors the first time around.
In all cases these fake verification errors appeared at 98 percent just as the buffer started emptying out and the disc speed slowed right down before going back up again.