When your optimisation reaches the pre-check stage, the surface and grading objects are processed for any preliminary errors that could prevent optimisation. If issues are found, the Low Optimisation Confidence warning dialog displays.
You are given two options:
In either case, the Notification Centre icon on the Optimisation Toolbar will indicate the number of issues detected:
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Click on the icon to open the Notification Centre.
The Notification Centre displays a list of known issues and, if possible, a suggestion to resolve the issues. You can individually dismiss or dismiss all of the notifications in the panel.
When optimisation is run again, the precheck will identify any remaining issues and report them.