Thanks for the input. I figured out the problem. I'm surprised we have gone this long without running into this before...
While the site is a community site (we are a newspaper group) many of our staff participate on the site in various ways. All of the internet connections for our 4 offices come through our central office so we appear as a single IP to the site. One subforum in the site is set up as an internal, company only, forum where we post company information. Yesterday, the HR person put a new form there and sent e-mails out to every body in the company including login information for people who had never logged on before. Apparantly we had a string of failed loggins. Since they all came from the same IP, evey user within our company was blocked.
My only complaint is that it also blocked access to the admin system.
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