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I have Sql Developer 18.2 working OK on my Mac (High Sierra 10.13.6)
Java(TM) Platform 1.8.0_161 Oracle IDE 126.96.36.199.1748 Versioning Support 188.8.131.52.1748
How did you install the product and was this a fresh install or an upgrade?
Try running it from a terminal and look for errors when it locks up.