Is that actually Proofgrade or are you trying to use the settings on something that isn’t the same thickness?
If it’s not Proofgrade, make sure you have the correct measured thickness of the material entered into the Unknown Materials slot, and have the settings correct for the material you are using. The default on Unknown Materials is to go to 1% power, which looks like absolutely nothing happening. That might be what you are seeing.
(And if you changed materials mid-job, give a quick check to the settings to make sure they’re showing what you want.)