I have an installation of Joomla 3.6.0
Community Builder 2.0.14
forum Kunena 4.0.11
Uddeim 3.9
the problem is when I try to convey a message instead of loading the charge me a white page to page without a line of code.
What could be causing this problem?
I found the problem and a solution for my site.
Somehow the Tapatalk Plugin is triggering this issue, when "Activities" are enabled in this plugin settings.
Once I disabled Activities, the sending of messages is working fine.
The way I found it, was to disable all my site plugins one after the other and see, if it works. This may be a solution for you as well.