cover and colored pencil brushes don't work in 2021

I have been using the cover pencil for the last 3 months, working on a children's book that my publisher is waiting on. It stopped working while I was using after I used the acrylic brush, and has never come back. What can I do to correct this?

thank you,


  • Hello Kristina, 

    Need some information to understand the issue.
    Did you make any changes to these brushes? Sometimes a brush reset could help. Please try.

    Sometimes closing and reopening the software can help. Please try

    Do other brushes in the Pens and Pencils category work?

    What type of layer were you using? Default or special?

    Are there any selections on the layer? Are there any merge modes on the layer?

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