you could start by giving us a fuller problem definition
They post a topic and YOU get a warning – when, what exactly does it say, where does it come up and when??
It could be a theme or plugin  issue
Plugins
Deactivate all but bbpress and see if this fixes.  if it does, re-enable one at a time to see which is causing the error.
Themes
If plugins don’t pinpoint the problem, as a test switch to a default theme such as twentytwelve, and see if this fixes.
		
	 
	
	
	
 
		
			
	
	
		
		Yes, I understand. But as you know, when you get truncated messages, there is a lot sensitive information. Ips and port etc.etc. But I have a lead right know of what it can be.. I’m using google apps so. I’ll be back with this if I found anything. The strange thing that is happens only with bbpress, not buddypress or wordpress.