The problem above is on a new 64 bit PC. I get the "Busy" icon. The sliders won't budge and changing values can only be done by numerical input. This is in CS5, 64 bit on a large file. Any input?
Does the problem happen if you decrease the image size? What graphics card are you using? Did you install the latest graphics driver? Please post the report generated by OpenGL Extensions Viewer.
FIle size was the answer. Sorry it took so long to get back to it, but I'd just shelved using it and just tried again with a smaller file. Thanks. Works fine.