hi Dennis,
Can you remember which version it was that featured a dimmer for this fixture? (so i can test). I don't how there could have been a dimmer as this unit just does not feature a dimmer function according the PDF online. I have checked the personality file again and all is okay; the shutter is normally open, so in theory you should see light-output.
Does the PDF still describe your fixture, or do your lights have a new software version or new PDF?
Please advise. Best regards,
Maarten