It’s usually suggested to install the Gear drivers, but I would check to see if you already have the Gear drivers installed first (they’re also installed by some other programs):
installer: Driver updates - GEAR Software
Also, have you tried “test writing of the whole cd” or “render to temporary file”?
And your montage passes the eyeglasses check test?
Do you have another CD burner you can try?
If you install the Gear drivers, I would usually make a system restore point first.
If they don’t help, and you didn’t have them installed previously, they can be uninstalled from Control Panel add/remove.