Has anyone ever had only the blue garble your data line before? One channel on my megatree is doing that. I see no evidence of power injection causing it. I run the test patterns on that channel, and red and green are perfect. Blue goes disco on me. So does the pulsating white pattern, and faint white still seems to do it (not just 100% brightness). Plugging in the data input at pixel 100 seems to sidestep the problem. Running real sequences at 30% brightness still exhibits the problem, on blue.

What could cause only the blue to cause problems? Should I be chasing down a bad pixel, or bad power injection? Is there a way on the WS2811 IC for the blue line [on a bad pixel] to short with only ground?