We have been using Amyuni's PDF Creator for about 2 years. Each time there is an update, we have a new set of problems. The newest update, which was to make it compatible with Vista, has rendered the dll useless on about 1 in 500 machines. We cannot pinpoint the problem but we have some very unhappy customers.

I am currently using Amyuni on one of my projects. I, too, have experienced some problems, but I find their tech support staff to be very helpful. Have you tried to send them an e-mail? If you can give them repro code, they will fix the problems.