Okay - I figured it out. I installed on my D: drive where I have a lot more space. This seems to be the problem. If I install it in "C:/program files (x86)/Filter Forge" it now works. I really hate it though that people give you the option of installing somewhere else and then apparently don't test whether that actually works, because it doesn't. If you're going to give somebody the option to install in an arbitrary spot then you ought to actually test out to see whether it works or not. Since my D: drive is MUCH bigger, I do a lot of installing there and I see this same problem over and over again so it's a pet peeve. Test your code people!
Darrell