Everything seems to be working great except for this, and it really messes me up when I’m trying to use the hook brush or eraser for example. The draw size slider slides. The displayed value number changes. But the cursor does not change size on the screen, and it always acts like a 64-size brush when ‘size matters.’ Please enlighten. Thank you. I did trash my pref’s as far as i can tell. Not aching to reinstall the program itself, but I suppose I could unzip and reinstall. Was this a bug that’s been fixed with a later version of the Installer? I was not a tester or early adopter of 42R; although I purchased ZBrush many many years ago, and am grateful for Pixologic’s generous upgrade policy over the years. 
This might be helpful:
Thank you Spyndel,thank you very much, from Mandel.