No idea when, but when I go to XWIS.net and hit the support forums, I get 404 Not Found.
This can be worked around by placing a ? in the link.
http://xwis.net/forums/index.php/forum/83-support/
vs
http://xwis.net/forums/index.php?/forum/83-support/
The same goes to the Download section:
http://xwis.net/forums/index.php/topic/177134-downloads/
vs
http://xwis.net/forums/index.php?/topic/177134-downloads/
Who broke the site?