Richard, the most common cause of problems for users trying to access sites is a firewall that is stripping "referrer information" from their browser.
So, you need to either tell the firewall to "trust" the site, or you'll need to disable it.
The setting you're looking for is the one that disables "HTTP_REFERER". Instructions on how to do this can be found on the software manufacturer's web site. There are some instructions for fixing Norton firewall products at http://service1.symantec.com/SUPPORT/nip.nsf/46f26a2d6dafb0a788256bc7005c3fa3/b9b47ad7eddd343b88256c6b006a85a8?OpenDocument&src=bar_sch_nam
The server admin can also fix this for everyone by editing the Moodle configuration page and changing the variable "secureforms" to "No".
Another possible cause of this problem is that sessions are not configured properly on the server. You can test this by calling the script http://yourserver/moodle/lib/session-test.php.
So, you need to either tell the firewall to "trust" the site, or you'll need to disable it.
The setting you're looking for is the one that disables "HTTP_REFERER". Instructions on how to do this can be found on the software manufacturer's web site. There are some instructions for fixing Norton firewall products at http://service1.symantec.com/SUPPORT/nip.nsf/46f26a2d6dafb0a788256bc7005c3fa3/b9b47ad7eddd343b88256c6b006a85a8?OpenDocument&src=bar_sch_nam
The server admin can also fix this for everyone by editing the Moodle configuration page and changing the variable "secureforms" to "No".
Another possible cause of this problem is that sessions are not configured properly on the server. You can test this by calling the script http://yourserver/moodle/lib/session-test.php.
Thanks for the info. Everything seems to be configured ok, this is the first problem I have had.
Thanks again.
Richard