Sorry guys - the Yahoo widget engine does some weird stuff when you are modifying and retesting a widget on a single PC. There are remnants of the last configuration that stay around and this was causing it to work on my PC when I retested it but to fail on a new install (which I discovered myself this morning when I installed it on a second PC). I'm pretty sure that the version that is there now works. Same download location:
http://mtruman42.googlepages.com/SeekThePeakWidget.zip
The name of the widget in the zip file is now STP.widget instead of "Seek The Peak.widget" which was necessary to (hopefully) avoid the repeat error for anyone who had tried to install the original bad version. Let me know if there are still issues.