help! adjustment brush bug lightroom??

Hi. 

Since i downloaded an update (probably since 9.3 version) when i use the adjtument brush it doesn't appear anymore the little circle, the one that if you click again you can go on tedit or erase that specifically brush. I don't know if it is a bug or if there is a way to see the brushes used on the picture. It's important cause sometime i have to modify one of the brushes I used but there is no way that i can select any of them.

Thanks