I cannot reproduce it using the 5.0.13.0 build. But it could be that the issue occurs only some specific combination of VNC/RDP/PING/CITRIX scans is used.Could you please ZIP and email to us the following folder:
%USERPROFILE%\Application Data\SmartCode Solutions\VNC Manager\
Please send it to support@s-code.com
What OS is installed on the computer with the VNC Manager?