I installed the update. I seem to have a problem with DVD-A and 4x DVD+R though.
At the end of the burn, the tray ejects and a completion message appears. The tray will no longer retract after this, until the machine is rebooted. It's not a Sony issue though - RecordNowDX lets me burn copy after copy without this issue.
DVD-A does not exhibit this behavior with other formats and/or speeds however....