I have been using PDF Creator for a number of years, and have had no problems with updating through the various versions using the default settings during the install.
I am, however, seeing issues with v1.7.2. All PDF’s created are blank, about 3kb in size. Reverting to v1.7.1 and retaining all settings produces the expected documents.
I am using Win7 Pro and MS Office 2010.
I had a similar problem and have reinstalled 1.7.1