Dear Edward,
I have contacted James and he is going to look at this again shortly with another tester, yes my apologies that was a typo I meant to say it flashes even if the 'Chauvet Colour Band Pix' battons are plugged directly into the desk with patch leads - bypassing all of the infrastructure cabling and 'Showtec DB 1-8' splitters ruleling out the environment. There are 7 fixtures on the DMX line and they are all the same with different addresses but flash at the same time even in blackout. I believe the tester was a swisson dmx tester. The issue started since upgrading to 7.9.4 from