I’m trying to paint my terrain and it somehow got stuck on “The brush is read only” It will not let me select any other brushes and is still that way if I close out and open again. not sure what to do from here, any suggestions appreciated.
Hi Chummy,
Welcome to our community! 
Which version of Unity do you use?
Thank you!
2020.3.27f
That’s a fairly old version. Maybe you are experiencing a bug. Could you update?
The latest of 2020 is 2020.3.36f1.