Can't figure a problem with Users not being able to log in.

Client emailed me this morning saying:

We have had several complaints from members who are having
trouble logging in. This has been going on for three weeks. When they
log in they are either sent to a blank page or redirected to the login
page with no . We have followed up with several of them, and
apparently after waiting several hours or trying the next day they can
get in and see a record of all of their previously failed login
attempts on their messages page.

For this server we have two separate Apache instances running accessed
via nginx. I am new at this and can't really pinpoint the problem. I
do know that if

$ sudo /home/django/bin/httpd restart

The problem goes away for a little while, but this isn't productive
and only delays fixing the problem.

If anyone has any ideas on what to check, or if you are willing to
help and need more information, please let me know.

Off the top of my head the Django version is 1.0.3 and we are using
Pinax.

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