Due to a problem in the Quartus® II software version 13.1 MegaWizard Plugin Manager, the Arria® V GZ and Stratix® V Transceiver PLL Megawizard™ show a "Dynamic reconfiguration of ATX PLLs is not supported in the current release" message when you place your cursor over the "Enable PLL reconfiguration" option.
Arria® V GZ and Stratix® V GX devices both support ATX PLL reconfiguration.
This problem is fixed starting with the Intel® Quartus® Prime Pro/Standard Edition Software version 14.0.