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I did try clearing my browser cache, rebooting, etc., but that didn't do it. I didn't clear my cookies, though. BTW, I use a broadband connection (cable) with a firewall and router on the inside.
However, I was able to login to the site using lynx (a text-based web browser available on most linux systems). So, I decided that it had to be IP based. I looked on my own sites (I use Protector, too, of course) at the settings to see what I might have triggered, but I'm still not sure.
In the end, a few hours later, I was able to get back onto the site.
I hope this helps others. Peace,
Mark