In my application I have one UDT type and about 30 instances of it. UDT type is quite big (about 600 tags). When I change or add any description, alarm, expresion in any tag of my structure, SCADA system breaks. SCADA still communicate with oppened windows before the change, but you cannot open any new window. If yo reestart the client, any window is showed. If I try browse my instances throw tag tree in designer application, error symbol appears and any tag instance is showed. I always have to reestart Ignition server when this situation happen.
In conclusion, I cannot make any change in my UDT type because I always have to reestart my server.