I have a working collection of applications for the PVC C600. the setup is one pvc600 connected to a DH485 network with two micrologix 1200's. This setup works just fine, except, when I compile a new software for the screen, it initially works all fine, until you power down. Once you power backup, there is no communications to & from the screen. Oddly, there is one of my applications that works fine regardless wether or not you cycle power to the screen. Despite this, I have interrogated every possible piece of the application, to compare it with others and cannot find any discrepancies. Anyone got any ideas ?