08-08-2018, 11:56 AM
Check what colour you have set for the background.
As Rich says, using the eraser on a layer without an alpha channel (such as a layer mask) causes the eraser to paint with the background colour - It's not erasing anything.
As Rich says, using the eraser on a layer without an alpha channel (such as a layer mask) causes the eraser to paint with the background colour - It's not erasing anything.