Mirtec MV-7L lifted lead detection

Has anyone had success utilizing the lifted lead/ height checker feature on a Mirtec MV-7L. We recently had two separate events where the machine did not detect a lifted lead using the ic/bridge inspector. The soldering results came back with out defect. I tried to program the lifted lead detector and do not get consistent results. I could use the north, east, south and west camera's to detect a lifted but feel that I should be able to use this feature as it was paid for. Any help would be greatly appreciated.

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