If you are using Window Defender Antivirus (Windows 10), update it to its latest malware definition in https://www.microsoft.com/en-us/wdsi/definitions before installing or upgrading to Commander 15.5.1 This release - corrects a regression in Commander 15.5.0 that prevents a K4's IP address setting from being saved between operating sessions (tnx to Dave K9FN and Dave N9FN) Notes 1. Update your firewall and anti-malware applications to consider this new version of Commander to be "safe" - 0 of 70 antivirus scanners accessible via Virus Total detected malware - 0 of 15 antivirus scanners accessible via Jotti detected malware - submitted for online analysis by Microsoft Windows Defender: no malware detected 2. If this upgrade doesn't work correctly, see the "After an Upgrade" section of http://www.dxlabsuite.com/dxlabwiki/ApplicationStoppedWorking Commander 15.5.1 is available via the DXLab Launcher and via http://www.dxlabsuite.com/download.htm 73, Dave, AA6YQ