Update - I am now Nuance free. Bloody PDF Converter was corrupted and kept crashing. I couldn't repair or uninstall it so ripped it out using Your Uninstaller! Re-booting and trying to install didn't work either. Enough. Adobe Acrobat X Pro seems to be rock solid, light on resources and, with an academic discount courtesy of my employer, will likely be fully licensed this time tomorrow.
Re: Paperport 11 Pro, I couldn't get it sorted out, either and after waiting for a month for Nuance support to respond, turfed it as well. I did buy a WaggleImage license, so may revisit it, if I find myself needing the functionality it provides in the future.