Problem

Since browsers save some cached information, I'm wondering if it's an incompatibility between something your browser has saved and the new server setup.

Could you clear your cache (offline data, cookies, etc.) and re-login... and let me know if you see it again?

It may be that I have to change the site configuration, but I just want to eliminate the possibility that it's a browser cache issue before I dive into the code again :)

The security token message might be that a webpage was open on a form for a while, and then when I modified the site, the hidden token in the HTML code became invalid. That's why I'm wondering if clearing the browser info will eliminate the problem by getting rid of any info it has saved from the old site configuration.