I downloaded and installed SeoTools, reopened Excel and tried to use the PixelWidth function, but got no return value. When I hit Enter it just has "=PixelWidth("Hello","Arial",11)" in the cell. The instructions did not say I had to license it, but I got a trial license and registered and restarted Excel again. Same result. I also tried other string operations. What do I have to do to get a return from SeoTools functions?