Description of problem:
- Launch Painter and create a new document
- Select a particle brush
- Open Brush Controls (Ctrl+B or Window > Show Brush Controls)
- Activate the Impasto palette
- Change Impasto settings
Impasto controls (such as "paint to") are enabled.
Since Impasto is not supported, the panel's controls should be disabled
The new particle brushes for Painter 2015 do not support Impasto.