Can you tell me your output settings on the FPP. Specifically how you configured the 'other' tab to get the DMX on the RJ45. I am having similar issues but know my crossover cable is fine. I think I messed up the settings somewhere. Also if I have say Universe 1 outputing to my moving heads, do I also need to put Universe 1 on the main E1.31 output tab in addition to the "OTHER" tab?