Question Cannot post to forum, not sure why?

No, the long code issue was related to these (your) forums not mine, we went off topic for a bit when I was trying to post some code from my site.

My site simply does not allow posts at all, you will probably need to go back to the first post and start fresh again to refresh your memory of the issue I am having.

Cheers

GW

Oh, yes, there was just more topics and messages that I could read in one day.

Page source code looks fine so something is happening after you hit submit.

What I would do next, is to get as much information as possible from that white page. There are few things you need to do:

1) If you haven't done it yet: please upgrade Kunena Latest 1.6.2, Kunena Login 1.6.2, Kunena Discuss 1.6.2 to 1.7.0. Most likely it doesn't solve your issue, but upgrade will fix others at least.
2) Upgrade Jomsocial 2.0.6 to the latest version (yours has serious bugs), but again, it's unlikely to fix your issues (one release broke posting in Kunena, but I don't think it was this one).
3) Joomla debug mode may reveal something.
4) You need to find Apache error log for your site and get the latest entries from there just after posting.

I think that the error log is the key to solve this issue and you could do that even before steps 1-2. It will almost always tell what is going wrong if you get white page without any content. Usually you get white pages in Kunena only if there's some kind of misconfiguration in the server software.