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This happens about once per second. I'm assuming it's the PHP part that's causing the problem because I haven't tried it in other configurations. It happens both on the embedded browser and with Chrome. Not only does it make interaction with the display difficult but the Browser DOM window is reset each time making that unusable. I'm using Netbeans 8.2 on a 64-bit Mac with MacOS 10.12.3 and Chrome 55.0.2883.95. Chris