When you attempt to drag 'n' drop a Cab4n SNMP Device into the design frame it disappears, i think this kind of bug has been seen before with a different device in an earlier version of Nware. I can confirm that this does work in all other versions of 1.4.x++ and 1.2.6++

Thanks for reporting that one. It is still a problem in later releases of NWare++, including 1.4.4. I'll make sure it's added to our bug database.
Andy.