Brush Viewing Problems, but NOT Caps Lock

I re-installed Photoshop after way too long away and am currently at a loss... I am actually using the Beta version of CS3, when I used to use CS, and so I'm not sure if this is a CS3 issue or a "my own idiocy" issue, but my brushes will NOT show up as stamps. They show up as the crosshair or as the paintbrush, but no image where I can SEE what I'm brushing while brushing it. It's very frustrating! I've tried with caps-lock both on and off, and neither way can I get a stamp/preview image to show up... If I use it, it shows up accurately on the image --- but I can only see what happened AFTER I do it, not during, which can be quite tormentful when trying to put everything in a just-right place.

I've tried looking through a lot of the various menus to see if there's something I can change, but I can't seem to find it myself and would love to hear from any of you!