Hmmm... maybe I'm not understanding this, but...
PasswordMaker does not password protect a web page - it allows you to manage passwords for sites that require you to login.
What Eric was saying is correct - if you are getting a password prompt *from* *PasswordMaker*, then it is because PM is detecting some login fields (username, password) on the page. It has always worked pretty much flawlessly for me, though there have been some issues when these fields were located in frames, or had strange names/tags.
Now, it is possible that something *else* is prompting you for a password.
What we'll need to give you a definitive answer is a screenshot of each machine showing the browser URL/Location bar, and the password prompt on the one prompting for a password.
I suspect that either the URL is different, or the password prompt is not from PasswordMaker.
If you don't have anything to grab screenshots, I really like and use the free version of Screenhunter:
www.wisdom-soft.com/products/screenhunter_free.htmCharles