I've not had much luck getting answers from this forum, but here goes:
I have never been able to get the OpenID plugin to work when I try to leave comments on other sites. When I tried logging on to Disqus, I got the following error message:
Fatal error: Define Auth_OpenID_RAND_SOURCE as null to continue with an insecure random number generator. in /mnt/web9/40/39/51978039/htdocs/blog/wp-content/plugins/openid/Auth/OpenID/CryptUtil.php on line 52
I've no idea what this means.