Why does the Brush cursor change from a circle to little crosshairs?
Check the Caps Lock key. When this key is pressed down, the cursor will change from a circle to little crosshairs.
This Caps Lock key issue is not a bug; it is by design, i.e., it is a feature. Many Elements tools give you the option of a precise cursor (the little crosshairs). Pressing the Caps Lock key enables you to toggle this cursor on and off. However, I can think of two situations in which you don't have the choice to toggle the crosshairs on and off by pressing the Caps Lock key.
1. When the size of the image is too small in proportion to the cursor. Elements will, then, display the crosshairs in order to show the brush in the right scale for the image. The workaround is to zoom in; this will bring the circle cursor back.
2. When you are using a 1-pixel brush (which always uses crosshairs.)
Elements 7,10,11,12,13,14,15 - Photoshop CC 2017 - Lightroom CC 2015 Windows 7 Pro & Windows 10 Pro