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G'day Leon. The drought could well affect the soil around the pier. This is more likely if you are in heavy clay soil (called 'highly reactive soil') and/or the pier is not set deep enough into the ground. BUT having said that, the amount of shift is unlikely to be so great that it would outstrip PHD's ability to track. Also, if it was so severe, it would be affecting your gotos as well. And since they seem to be spot on, I think you can put that aside for the moment. Obviously you will want to throw a spirit level across the pier just to check it but I'd be looking elsewhere.
Peter
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