Hi, I suggest that the box of the eraser on a tilemap object does not disappear when you click.
This happens and then you're not sure where you are erasing.
In my example I use four tiles to clear, when you click and hold, the mark disappears and can not control well the blanking zone.
The windows cursor disappears when capture the screen, this has nothing to do with the problem, it is only information if you wonder where the cursor is.
Here you can see how the dark zone disappears when you click.
Why disappear ?, I think there is no need for that, should remain visible.