Telnet hangs after updating NETOS4

After updating our NETOS4 the telnet server enters abort handler or undefined handler (app dependend) on connecting a telnet client. replacing the new na2.lib with the old one works. it seems the new telnet server jumps to a undefined/uninitialized function pointer? the new sample application hangs too. Any idea whats wrong?

Download the latest libraries off the web and then rebuild your application to see if you see the same behavior or not.

Yes, I have the latest version of the libs. The old one works fine, the new one enters the exception handler.