The issue with coComment I mentioned here has been fixed.
We initially suspected some browser issue related to security but quickly found out this could not the the case. After deeper investigation, we identified that the time on one of our servers was not correct and jammed our anti-spam system. This was reducing the time you have between entering the page and submitting the comment (and this is why it took us some time to identify the issue as when we tested the comment submitting it was always working).Yow. I have some sympathy - issues like that can be tricky to resolve.