No pins visible in Photoshop CS6 Extended Blur Gallery

In the Blur Gallery of CS6 the blur pins are not visible. I have tried the shortcut H to show the pins, but this did not affect any change. The pin with the adjustment ring and the other adjustment points are not visible. I seem to be able to add pins with the cursor (push pin with + is visible) and make adjustments on the sliders, but no pins. The M key will display the mask and the P key will toggle the preview on/off. The problem exists in all 3 blur filters (Field, Iris, Tilt-Shift). I'm operating on a PC running Windows 7 Pro 64 bit, with 12 GB of RAM. The program is Photoshop CS6 Extended. I don't seem to have any other Photoshop issues to date. I've closed and opened the program, restarted the computer, and re-loaded the program from the disk. No change. Any help?