Just noticed this right now. I completed a line art drawing and added a new layer below to color the line art. Without warning ASP stopped letting me add any paint to the new layer. This is clearly not correct because I’ve been able to do this repeatedly before with no issues. I was forced to copy and paste the artwork into another program to complete the painting process. This behavior may not be repeatable for demonstration purposes because it’s a rare issue. However this is not the first time I’ve seen this happen. I just thought to put this out there as a warning. I think the devs have to look at this one.