CAOS will be down tonight at approximately 12AM tomorrow (midnight) for an hour or so. I'm putting it into debug mode, hoping to find what's wrong with the reply button, and hopefully resolve a few security issues.
Yarrrgh, the Reply-button problem won't show up when I'm in debug mode. This is immensely frustrating.
Just as a heads-up, I'll probably dump into debug mode and close the site the next time I see the problem show up, so it may be in the middle of the day (though I'll hopefully do it at night). I'll do my best to keep the downtime to about 15 minutes if I do do it during the day.
I recommend filing a bug report to Xoops or emailing them for pointers on how the site works.