I hate to sound like PTC tech support, but it is probably your graphics card. Wildfire has a shorter list of supported graphics cards than previous releases. You can review the list from the PTC web site.
If your card is supported, search the web for the latest PTC tested graphics card driver.
If your card isn't supported, try turning off the OpenGL performance tuning options by setting the graphics config.pro option to win32_gdi.
I checked my card and it's not on the hangman list. I'm running the NVIDIA GeForce4 Ti 4200. Everything else seem fine.. shading, spinning, retrieval...so I'm not sure what's up. I did notice the GeForce2's were gone. I am not sure if the 4's would be categorized the same. Somehow I doubt it. I'm still searching.....