The bug I discovered after I installed Nuance Power PDF Advanced on my computer appears to have been fixed. I reported in an earlier post that PDF files created by the new software often, though not always, put a watermark on pages indicated that the file was produced by a trial version of the program, even though the program was registered and activated.
I have been documenting my interaction with the technical support people at Nuance in my original post. Readers of that post who have not been reading my updates but who are interested in my experience may want to return to that post and read about my experience.
I am inclined to believe that Power PDF Advanced is an excellent program for creating and manipulating PDF files, but I have not systematically examined all its features. Certainly, the software embodies some design decisions different from those I would have made. In any case, Nuance offers a free trial, as well as a money-back guarantee.