Invalid Address specified to RtlFreeHeap with gloox::JID::full()

["Federico Rossi" <f.rossi@xxxxxxxxxxxxxxxxxxxx>]

Hi,
I'm using Gloox vers. 8.7-sic built with Visual Studio .NET 2003 under
Windows XP.
My Gloox Library was built with zLib, GnuTLS and LIBidn support.
In my applications I obtain an Unhandled Exception when I call the 
gloox::JID::full() method.
For example in the message_test.cpp example

   virtual void handleMessageEvent( const JID& from, MessageEventType 
event )
   {
      printf( "received event: %d from: %s\n", event, 
from.full().c_str() );
   }

I have the following error message from Visual Studio:

HEAP[Test_Gloox_Console.exe]: Invalid Address specified to RtlFreeHeap( 
00D50000, 00C5DDF0 )
Unhandled exception at 0x7c911230 in Test_Gloox_Console.exe: User 
breakpoint.

The debug watch of the variable "from" is:

from {m_resource={"gaim"} m_username={"gaim_comp"} 
m_server={"goldrake.iet.unipi.it"} m_server_raw={"goldrake.iet.unipi.it"} } 
const gloox::JID &

Can anyone help me?
Thanks

Federico