did you try to downgrade Solutions Enabler, in the guide you linked to they are using 7.2
Is there a place where you can find the compatibility between Flare version and Solutions Enabler/NavCLI software. I have tried going through the EMC documentation I can find but a root canal would be less painful. CX4 is running Flare version 4.30.000.5.524 Using Solutions Enabler version 8.0.3
CX4 Flare version/Solutions Enabler compatibility