Hello,
You seem to be ‘suffering’ of two problems. Not knowing the state your brush currently is, and holding a modifier key to activate the eraser.
Both have solutions (although one of them is from an external plugin)
The first: Changing the cursor when in Eraser Mode
Go to Settings → Configure Krita → General → Use separate settings for eraser
The second: Holding a modifier key to activate the Eraser
Using the Plugin Shortcut Composer v1.1.1 - Plugin for Pie menus, Multiple key assignment, Mouse trackers and more!
P.S.: Hello @sooz I was slow answering because I’m on my Windows machine and had to update Krita to check the correct ‘path’ to the Eraser Cursor in the menu. ![]()