I just update my Adobe Illustrator into version 25.1 in Mac Big Sur. I just notice when I make rounded corner line and lower the opacity you will see some weird line.
This problem also appear when I use pen tool
I didn't see the problem before I update the latest Illustrator. Is it bug?
The long answer is Ctrl/Cmd+E.
Wow that's work, so something wrong with my gpu?
Ctrl/Cmd+E toggles between GPU and CPU Preview, GPU causing the issue.
This is what GPU is about:
GPU is faster, sometimes too fast.
Graphics cards are included in the system requirements:
Apart from an inadequate card, the issue can be caused by lack of driver updating, lack of proper recognition of the card by the computer, and whatnot (including rifts in the space time, moon, weather, and the fact that Illy sometimes moves in mysterious ways).
Here are a few more pages about GPU troubleshooting:
I've been experiencing the same thing and it's never been there until recently. I understand switching to CPU view will "fix" it, but I don't understand why this is suddenly an issue.
That is strange; unless there has been some OP/AI update with unexpected effects.
Have you tried the link?