I'm a professional illustrator, been using AI for years. I opened up my computer this morning and tried to work on a document in Illustrator and noticed the pencil tool having really weird behavior. The lines were coming out quite wobbly, and when I tried to retrace them to smooth them (a common part of my drawing guesture), it doesn't smooth, it adds more anchor points and makes it more wobbly. I tried looking it up and saw that it might be the fidelity setting but I hadn't changed the fidelity since last night. When I did turn smooth up to max, it made a slight improvement, but was still nowere near the behaviour I was used to. I tried hooking up my older Wacom and the problem persisted it's not the tablet. Reinstalled Illustrator and problem persisted. I booted up my old laptop tried the pen tool in Illustrator on that device. It worked exactly the way I expected. Same tablet, same version of Illustrator. Only thing that's different is the computer. I'm on a 2018 Macbook pro running Big Sur 11.1. The old laptop is on Mojave 10.14.4. Could it be the OS? I updated my new laptop weeks ago, I'm not sure why it would suddenly create a problem for Adobe.
I've attached a video that demonstrates what's happening. The first part is the weird, wobbly behavior I expereinced this morning on the Big Sur device. The second part is the behavior on the Mojave device. This is what I expect to happen with the pencil tool
Update: I reverted to the previous version of Illustrator (25.0.1) and got it to work as expected. I'm still not sure what the problem was
So you are using a Wacom?
Can you check if its driver is fully compatible with Big Sur?
And maybe it needs a preferences reset?
I too had the exact same issue with the pencil tool, right after Illustrator automatically updated this morning. When going over a line while drawing it adds a lot of extra points that it never did before. If you go over a line more that once, it keeps adding even more points. I know the problem is with the update, because I too reverted to the program prior to the update and the issue is resolved. Please, Adobe, correct this pencil issue in your latest update.
I also had the same issue with the pencil tool. My pencil tool kept adding extra points when I tried to draw over it to smooth it out. After reading this conversation, I reverted to the previous version of Illustrator (25.0.1) and got it to work as it had before. Thank you for posting your update @annm89579550 ! I hope Adobe fixes this bug in their next update.