When the "eraser switch size" option is ticked, both the eraser and normal brush size will be the same if you use the select tool and press "e" to activate the eraser mode. it does not matter if it was on or off, it will forget the alternate brush size.

if, for example, the normal brush size = 5 and eraser size 10, after the bug, both the brush and eraser will have the same size (depending on the state of the eraser mode when doing the bug, the size will either be 5 or 10)

Reproducible: Always

Steps to Reproduce:
1.Set normal brush size, and eraser size to different values
2.select another tool (lasso tool)
3. Press "e" to switch eraser mode
4. go back to the brush tool

Actual Results:  
the brush and erase sizes are the same.

Expected Results:  
the brush and eraser size should be different.

OS : Win7
I did not test this with other tools, maybe the bug occurs with other tools.