I assume this happened because when you downgraded on your system to WebIQ 2.15.6 you did not delete the 2.15.7 Visuals package in your %APPDATA% directory. If you then edited the HMI again you used WebIQ Server 2.15.6 with WebIQ Visuals 2.15.7. As Runtime Manager only checks if the server version has changed which wasn't the case here obviously no warning could be shown as this was a non-supported setup then.
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