Check your setup in the Wacom driver.
If that does not work:
- Which version?
- Which system?
- Which tablet?
- Which driver version?
- Any third party plugins?
I'm using Illustrator CC 21.0.2. on the Intuos Pro Medium Driver version 6.2.20-11. It works in Photoshop and other programs, just not in Illustrator
That Wacom driver might be not the latest one (although the latest driver might cause issues as well - you never know unfortunately). So try and update the driver. But please check the settings in the driver first.
In addition to what Monika said, if mystery reamins, you may consider pen failure.
Have you checked the settings in your Wacom preference settings? Make sure the "eraser" end is set to "Eraser".
Open Wacom Tablet Properties.
Select your Pen.
Hit the ( - ) button to remove the Pen.
Touch the pen to the tablet to pair it again.
It'll wipe your custom settings for the pen but it's better than having to redo your entire settings like reinstalling the driver.
Thank you Graysfang! You are my Wacom gaurdian angel, I've been trying to solve this problem for over 7 months. This fixed all my issues with both the eraser and pressure sensitivity not working in Photoshop.
This has been low-key bugging me for *years* and I'd lost count of the amount of fruitless searches I'd done to find the answer. But now I've started a new project doing a lot more painting in PS it became a major annoyance.
Thank you, thank you, thank you.
After playing with the Wacom settings, it appears that it only occurs after calibrating the screen if your using a cintiq. As (Graysfang) mentioned above, if you hit the little ( - ) next to it, it will delete the pen settings. After that, touch the screen for it to work again, and redo your pen settings but don't calibrate it again or it'll not work properly all over again. Hope this helps.