I went to the Newegg site and manually logged in. 1P saved the results.
When I double-click on Newegg within the 1P program, the login fails with "Validation text you entered is incorrect. Please try again." I then type in the password and succeed.
Oddly, if I go to Newegg's login page manually, then use the browser 1P menu to Fill & Submit, it works.
Mac OS X 10.6.3