Version 2.6.3 is where I found it and see no change notices about it
PLC Engineering locks up when logging out
When the Application loses connection to a plc the user can not logout without experiencing a long hang time. This occurs when the connection timeout has not been triggered yet but the communication has already been terminated. (I found this largely because my adapter is on the way out and disconnecting regularly) Seems like a simple timeout needs to be added and it should fix the issue.
