I downloaded the try before you buy but would get this error. If I hit enter 4 times it went away. It displayed when I tried changing some options.

I know you've already closed this discussion from January but most people attribute the problem to a corrupted Arial font.

It was not the case for me. What cured the problem was a simple re-boot. Remember those old days when we always HAD to re-boot after every new install?? LOL

Just this might help someone. BTW I bought a license once that problem disappeared. A very reasonable price.