You may remember my problem from a few weeks ago -- losing the ability to make new internet connections from my laptop.
We didn't get to the bottom of it then, but right after that, Zyxel released new v1.5 firmware for the P-330W router that not only resolved the problem, but added some new functions that have come in handy.
Just thought I'd let you in on the answer to the mystery and thank you for your help.