This problem was experienced on Windows XP SP2.
How to reproduce:
1. Open the standalone Photo-Toolkit application.
2. Go to a folder with a few photo's.
3. Click on one of the photo's that are present in the file list.
4. That photo should now be displayed in the Image Window.
5. Now click on another photo that is present in the file list.
6. That photo should now also be displayed in the Image Window.
7. Click on the down-arrow next to the Color Cast button and choose "Manual Correction".
8. The Color Correction tool will now start and will display the "Invalid floating point operation" error.