I don't know if this has something to do with the latest Raw update.
But for some reason, when I select Mask for my adjustment brush and start to paint with it, I can barely see it. I used to be able to see it just fine.
I played with different colours and all the settings are at maximum, but I get no change.
Thanks in advance.
I have the latest update, and no problems with mask visibility. Maybe a screenshot or two, of your mask settings and the image?
And I guess somewhere along the way you should turn off the graphics processor in ACR preferences.