After a few people complained, I was able to illicit the help of one Paul Rubenstein to help figure out what was wrong. I sent him a debug version of the resizer and he installed it, hit the repro and sent me the log files. That in turn helped me figure out why the "Set Defaults" button was not working properly.
You can download the new version in the Download page.
Thanks, Paul, for helping me figure out what was going wrong.