This is solved in CAESES-FFW version 3.0.18. Please update to this version. When launching CAEFES 3.0.15 on RedHat 5.10, I get the licensing panel. After I choose Free Edition and Next, the application exits. In the terminal window are the following messages: QLayout: Attempting to add QLayout "" to FRegisterRegPage "", which already has a layout QLayout: Attempting to add QLayout "" to FRegisterRegPage "", which already has a layout /a/fine/CAESES-FFW_3.0.15/CAESES-FFW.sh: line 81: 4143 Segmentation fault ${HERE}/bin/Linux.x86_64/CAESES-FFW $ARGS "$@"