error toon boom color

Did you try to flatten the drawing before painting the right side? Did you try the close gap tool? I would also try rebooting toonboom. Sometimes when you experience a glitch like that toonboom has to be restarted.

Hard to see what was going on, try those three things and see if it works. I tried to replicate this problem but was unable. Everything worked fine for me. ???

Thank you all ^ _ ^ ;D

Did flattening work for you?

It shouldn’t make a difference, but do you see the same issue when you draw a line of non-zero width, and then paint, and then set the line width to zero? I don’t have this issue on my machine here. Sometimes it’s also just a graphical display issue, but I’m not sure whether this is the case here.