CMS Made Simple Forums

I've installed the chat module and now my page is no longer reachable. are there any known problems with this module or can it have something to do with cookies? The url looks like this:

http://www.rockcafe.be/index.php?mact=C ... eturnid=15

Works now, forgot params but now when I try to chat I get this message in my browser:

Method Not Allowed
The requested method POST is not allowed for the URL /index.html.

Could it be because I have an index.html file in my cms folder?

Can you check in the backend if the flag is set in Global Settings for "Site maintenance", if so, remove it. Also you can check if no modules appear that still need to be installed, or that are just transferred.

Ronny