Please show your Appearance panel with the shape selected.
thanks for your reply.
My Appearance panel is Japanese, so I put English translation.
The crack occurs when I lower opacity, but I did not see the crack in previous version.
Please refer an attached jpg.
It doesn't make any sense. You have no stroke and 40% opacity for the fill. Is this every time you use the Pen tool? It's late in my time zone, and I am shutting down my computer, so I hope another volunteer answers shortly.
yes , It happens everytime when i use pen tool.
oh, I could fixed the problem.
The cracks diappeared when I deselect "line" section.
This is probably caused by the GPU acceleration.