switching from the eraser, back to same brush i was using

I chosed a custom brushed that is different from the default round brush, in order to draw. I like to switch between the eraser and the brush in order to like, draw things like I ever did. But since recently, when I switch back to the brush, it goes back to the default round basic brush. Which means I have to reselect the custom brush everytime I erase something. This never happened before, it must be the new "up"-date working its magic... 

Anyone got a solution for this? Thankssss